Finding the Fourth Proportional to 1,057.55, 1,459.17 and 637.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.55 : 1,459.17 = 637.56 : x
2. Step 2: Convert to fraction form
   1,057.55/1,459.17 = 637.56/x
3. Step 3: Cross multiply
   1,057.55x = 1,459.17 × 637.56
4. Step 4: Simplify right side
   1,057.55x = 930,308.43
5. Step 5: Solve for x
   x = 930,308.43/1,057.55
6. Step 6: Final answer
   x = 879.69