Finding the Fourth Proportional to 1,099.78, 1,517.69 and 602.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.78 : 1,517.69 = 602.42 : x
2. Step 2: Convert to fraction form
   1,099.78/1,517.69 = 602.42/x
3. Step 3: Cross multiply
   1,099.78x = 1,517.69 × 602.42
4. Step 4: Simplify right side
   1,099.78x = 914,280.73
5. Step 5: Solve for x
   x = 914,280.73/1,099.78
6. Step 6: Final answer
   x = 831.33