2.48>2.4 1>2.463 what is the unknown digit

The middle value must be between 2.463 and 2.480. This means that the possible choics for the middle value are:

2.464

2.465

2.466

2.467

2.468

2.469

2.470

2.471

2.471

2.472

2.473

2.474

2.475

2.476

2.477

2.478

2.479

The only value in this list that ends with a "1" is 2.471, so the missing digit must be a 7.