Finding the Fourth Proportional to 1,057.84, 1,459.92 and 615.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.84 : 1,459.92 = 615.89 : x
2. Step 2: Convert to fraction form
   1,057.84/1,459.92 = 615.89/x
3. Step 3: Cross multiply
   1,057.84x = 1,459.92 × 615.89
4. Step 4: Simplify right side
   1,057.84x = 899,150.13
5. Step 5: Solve for x
   x = 899,150.13/1,057.84
6. Step 6: Final answer
   x = 849.99