Finding the Fourth Proportional to 1,086.28, 1,499.05 and 607.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.28 : 1,499.05 = 607.74 : x
2. Step 2: Convert to fraction form
   1,086.28/1,499.05 = 607.74/x
3. Step 3: Cross multiply
   1,086.28x = 1,499.05 × 607.74
4. Step 4: Simplify right side
   1,086.28x = 911,032.80
5. Step 5: Solve for x
   x = 911,032.80/1,086.28
6. Step 6: Final answer
   x = 838.67