Finding the Fourth Proportional to 139,937.76, 192,978.44 and 88,860.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,937.76 : 192,978.44 = 88,860.40 : x
2. Step 2: Convert to fraction form
   139,937.76/192,978.44 = 88,860.40/x
3. Step 3: Cross multiply
   139,937.76x = 192,978.44 × 88,860.40
4. Step 4: Simplify right side
   139,937.76x = 17,148,141,369.78
5. Step 5: Solve for x
   x = 17,148,141,369.78/139,937.76
6. Step 6: Final answer
   x = 122,541.20