Finding the Fourth Proportional to 1,086.57, 1,499.40 and 614.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.57 : 1,499.40 = 614.43 : x
2. Step 2: Convert to fraction form
   1,086.57/1,499.40 = 614.43/x
3. Step 3: Cross multiply
   1,086.57x = 1,499.40 × 614.43
4. Step 4: Simplify right side
   1,086.57x = 921,276.34
5. Step 5: Solve for x
   x = 921,276.34/1,086.57
6. Step 6: Final answer
   x = 847.88