Finding the Fourth Proportional to 1,057.83, 1,459.71 and 615.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.83 : 1,459.71 = 615.57 : x
2. Step 2: Convert to fraction form
   1,057.83/1,459.71 = 615.57/x
3. Step 3: Cross multiply
   1,057.83x = 1,459.71 × 615.57
4. Step 4: Simplify right side
   1,057.83x = 898,553.68
5. Step 5: Solve for x
   x = 898,553.68/1,057.83
6. Step 6: Final answer
   x = 849.43