Finding the Fourth Proportional to 139,098.20, 192,000.78 and 81,736.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,098.20 : 192,000.78 = 81,736.52 : x
2. Step 2: Convert to fraction form
   139,098.20/192,000.78 = 81,736.52/x
3. Step 3: Cross multiply
   139,098.20x = 192,000.78 × 81,736.52
4. Step 4: Simplify right side
   139,098.20x = 15,693,474,634.48
5. Step 5: Solve for x
   x = 15,693,474,634.48/139,098.20
6. Step 6: Final answer
   x = 112,822.99