Finding the Fourth Proportional to 1,099.91, 1,517.88 and 602.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.91 : 1,517.88 = 602.55 : x
2. Step 2: Convert to fraction form
   1,099.91/1,517.88 = 602.55/x
3. Step 3: Cross multiply
   1,099.91x = 1,517.88 × 602.55
4. Step 4: Simplify right side
   1,099.91x = 914,598.59
5. Step 5: Solve for x
   x = 914,598.59/1,099.91
6. Step 6: Final answer
   x = 831.52