Finding the Fourth Proportional to 1,057.67, 1,459.59 and 615.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.67 : 1,459.59 = 615.61 : x
2. Step 2: Convert to fraction form
   1,057.67/1,459.59 = 615.61/x
3. Step 3: Cross multiply
   1,057.67x = 1,459.59 × 615.61
4. Step 4: Simplify right side
   1,057.67x = 898,538.20
5. Step 5: Solve for x
   x = 898,538.20/1,057.67
6. Step 6: Final answer
   x = 849.54