Finding the Fourth Proportional to 1,057.48, 1,459.62 and 638.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.48 : 1,459.62 = 638.10 : x
2. Step 2: Convert to fraction form
   1,057.48/1,459.62 = 638.10/x
3. Step 3: Cross multiply
   1,057.48x = 1,459.62 × 638.10
4. Step 4: Simplify right side
   1,057.48x = 931,383.52
5. Step 5: Solve for x
   x = 931,383.52/1,057.48
6. Step 6: Final answer
   x = 880.76