Finding the Fourth Proportional to 1,099.89, 1,517.81 and 634.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.89 : 1,517.81 = 634.29 : x
2. Step 2: Convert to fraction form
   1,099.89/1,517.81 = 634.29/x
3. Step 3: Cross multiply
   1,099.89x = 1,517.81 × 634.29
4. Step 4: Simplify right side
   1,099.89x = 962,728.53
5. Step 5: Solve for x
   x = 962,728.53/1,099.89
6. Step 6: Final answer
   x = 875.30