Finding the Fourth Proportional to 1,086.91, 1,499.96 and 614.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.91 : 1,499.96 = 614.78 : x
2. Step 2: Convert to fraction form
   1,086.91/1,499.96 = 614.78/x
3. Step 3: Cross multiply
   1,086.91x = 1,499.96 × 614.78
4. Step 4: Simplify right side
   1,086.91x = 922,141.90
5. Step 5: Solve for x
   x = 922,141.90/1,086.91
6. Step 6: Final answer
   x = 848.41