Finding the Fourth Proportional to 1,099.67, 1,517.55 and 602.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.67 : 1,517.55 = 602.31 : x
2. Step 2: Convert to fraction form
   1,099.67/1,517.55 = 602.31/x
3. Step 3: Cross multiply
   1,099.67x = 1,517.55 × 602.31
4. Step 4: Simplify right side
   1,099.67x = 914,035.54
5. Step 5: Solve for x
   x = 914,035.54/1,099.67
6. Step 6: Final answer
   x = 831.19