Finding the Fourth Proportional to 1,087.92, 1,501.20 and 615.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.92 : 1,501.20 = 615.84 : x
2. Step 2: Convert to fraction form
   1,087.92/1,501.20 = 615.84/x
3. Step 3: Cross multiply
   1,087.92x = 1,501.20 × 615.84
4. Step 4: Simplify right side
   1,087.92x = 924,499.01
5. Step 5: Solve for x
   x = 924,499.01/1,087.92
6. Step 6: Final answer
   x = 849.79