Finding the Fourth Proportional to 1,086.40, 1,499.30 and 614.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.40 : 1,499.30 = 614.42 : x
2. Step 2: Convert to fraction form
   1,086.40/1,499.30 = 614.42/x
3. Step 3: Cross multiply
   1,086.40x = 1,499.30 × 614.42
4. Step 4: Simplify right side
   1,086.40x = 921,199.91
5. Step 5: Solve for x
   x = 921,199.91/1,086.40
6. Step 6: Final answer
   x = 847.94