Finding the Fourth Proportional to 139,337.05, 192,285.50 and 81,978.53

Step by Step Solution

1. Step 1: Write the proportion equation
   139,337.05 : 192,285.50 = 81,978.53 : x
2. Step 2: Convert to fraction form
   139,337.05/192,285.50 = 81,978.53/x
3. Step 3: Cross multiply
   139,337.05x = 192,285.50 × 81,978.53
4. Step 4: Simplify right side
   139,337.05x = 15,763,282,220.42
5. Step 5: Solve for x
   x = 15,763,282,220.42/139,337.05
6. Step 6: Final answer
   x = 113,130.59