Finding the Fourth Proportional to 1,057.59, 1,459.58 and 615.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.59 : 1,459.58 = 615.33 : x
2. Step 2: Convert to fraction form
   1,057.59/1,459.58 = 615.33/x
3. Step 3: Cross multiply
   1,057.59x = 1,459.58 × 615.33
4. Step 4: Simplify right side
   1,057.59x = 898,120.28
5. Step 5: Solve for x
   x = 898,120.28/1,057.59
6. Step 6: Final answer
   x = 849.21