Finding the Fourth Proportional to 1,057.56, 1,459.39 and 615.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.56 : 1,459.39 = 615.46 : x
2. Step 2: Convert to fraction form
   1,057.56/1,459.39 = 615.46/x
3. Step 3: Cross multiply
   1,057.56x = 1,459.39 × 615.46
4. Step 4: Simplify right side
   1,057.56x = 898,196.17
5. Step 5: Solve for x
   x = 898,196.17/1,057.56
6. Step 6: Final answer
   x = 849.31