Finding the Fourth Proportional to 143,616.25, 198,061.39 and 89,906.15

Step by Step Solution

1. Step 1: Write the proportion equation
   143,616.25 : 198,061.39 = 89,906.15 : x
2. Step 2: Convert to fraction form
   143,616.25/198,061.39 = 89,906.15/x
3. Step 3: Cross multiply
   143,616.25x = 198,061.39 × 89,906.15
4. Step 4: Simplify right side
   143,616.25x = 17,806,937,038.55
5. Step 5: Solve for x
   x = 17,806,937,038.55/143,616.25
6. Step 6: Final answer
   x = 123,989.71