Finding the Fourth Proportional to 139,469.60, 192,512.08 and 89,168.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,469.60 : 192,512.08 = 89,168.80 : x
2. Step 2: Convert to fraction form
   139,469.60/192,512.08 = 89,168.80/x
3. Step 3: Cross multiply
   139,469.60x = 192,512.08 × 89,168.80
4. Step 4: Simplify right side
   139,469.60x = 17,166,071,159.10
5. Step 5: Solve for x
   x = 17,166,071,159.10/139,469.60
6. Step 6: Final answer
   x = 123,081.10