Finding the Fourth Proportional to 1,057.72, 1,459.20 and 708.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.72 : 1,459.20 = 708.52 : x
2. Step 2: Convert to fraction form
   1,057.72/1,459.20 = 708.52/x
3. Step 3: Cross multiply
   1,057.72x = 1,459.20 × 708.52
4. Step 4: Simplify right side
   1,057.72x = 1,033,872.38
5. Step 5: Solve for x
   x = 1,033,872.38/1,057.72
6. Step 6: Final answer
   x = 977.45