Finding the Fourth Proportional to 1,086.61, 1,499.60 and 614.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.61 : 1,499.60 = 614.56 : x
2. Step 2: Convert to fraction form
   1,086.61/1,499.60 = 614.56/x
3. Step 3: Cross multiply
   1,086.61x = 1,499.60 × 614.56
4. Step 4: Simplify right side
   1,086.61x = 921,591.96
5. Step 5: Solve for x
   x = 921,591.96/1,086.61
6. Step 6: Final answer
   x = 848.14