Finding the Fourth Proportional to 139,834,289.28, 192,972,143.82 and 81,131,907.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,834,289.28 : 192,972,143.82 = 81,131,907.72 : x
2. Step 2: Convert to fraction form
   139,834,289.28/192,972,143.82 = 81,131,907.72/x
3. Step 3: Cross multiply
   139,834,289.28x = 192,972,143.82 × 81,131,907.72
4. Step 4: Simplify right side
   139,834,289.28x = 15,656,198,164,934,808
5. Step 5: Solve for x
   x = 15,656,198,164,934,808/139,834,289.28
6. Step 6: Final answer
   x = 111,962,511.09