Finding the Fourth Proportional to 1,057.86, 1,459.71 and 615.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.86 : 1,459.71 = 615.69 : x
2. Step 2: Convert to fraction form
   1,057.86/1,459.71 = 615.69/x
3. Step 3: Cross multiply
   1,057.86x = 1,459.71 × 615.69
4. Step 4: Simplify right side
   1,057.86x = 898,728.85
5. Step 5: Solve for x
   x = 898,728.85/1,057.86
6. Step 6: Final answer
   x = 849.57