Finding the Fourth Proportional to 139,834,290.72, 192,972,145.92 and 81,131,909.16

Step by Step Solution

1. Step 1: Write the proportion equation
   139,834,290.72 : 192,972,145.92 = 81,131,909.16 : x
2. Step 2: Convert to fraction form
   139,834,290.72/192,972,145.92 = 81,131,909.16/x
3. Step 3: Cross multiply
   139,834,290.72x = 192,972,145.92 × 81,131,909.16
4. Step 4: Simplify right side
   139,834,290.72x = 15,656,198,613,191,702
5. Step 5: Solve for x
   x = 15,656,198,613,191,702/139,834,290.72
6. Step 6: Final answer
   x = 111,962,513.15