Finding the Fourth Proportional to 1,087.56, 1,500.86 and 615.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.56 : 1,500.86 = 615.42 : x
2. Step 2: Convert to fraction form
   1,087.56/1,500.86 = 615.42/x
3. Step 3: Cross multiply
   1,087.56x = 1,500.86 × 615.42
4. Step 4: Simplify right side
   1,087.56x = 923,656.18
5. Step 5: Solve for x
   x = 923,656.18/1,087.56
6. Step 6: Final answer
   x = 849.29