Finding the Fourth Proportional to 1,087.91, 1,501.18 and 615.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.91 : 1,501.18 = 615.86 : x
2. Step 2: Convert to fraction form
   1,087.91/1,501.18 = 615.86/x
3. Step 3: Cross multiply
   1,087.91x = 1,501.18 × 615.86
4. Step 4: Simplify right side
   1,087.91x = 924,516.71
5. Step 5: Solve for x
   x = 924,516.71/1,087.91
6. Step 6: Final answer
   x = 849.81