Finding the Fourth Proportional to 139,090.80, 192,000.60 and 88,863.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,090.80 : 192,000.60 = 88,863.60 : x
2. Step 2: Convert to fraction form
   139,090.80/192,000.60 = 88,863.60/x
3. Step 3: Cross multiply
   139,090.80x = 192,000.60 × 88,863.60
4. Step 4: Simplify right side
   139,090.80x = 17,061,864,518.16
5. Step 5: Solve for x
   x = 17,061,864,518.16/139,090.80
6. Step 6: Final answer
   x = 122,667.10