Finding the Fourth Proportional to 1,086.57, 1,499.61 and 614.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.57 : 1,499.61 = 614.55 : x
2. Step 2: Convert to fraction form
   1,086.57/1,499.61 = 614.55/x
3. Step 3: Cross multiply
   1,086.57x = 1,499.61 × 614.55
4. Step 4: Simplify right side
   1,086.57x = 921,585.33
5. Step 5: Solve for x
   x = 921,585.33/1,086.57
6. Step 6: Final answer
   x = 848.16