Finding the Fourth Proportional to 139,105,786.08, 208,659,398.94 and 81,557,700.96

Step by Step Solution

1. Step 1: Write the proportion equation
   139,105,786.08 : 208,659,398.94 = 81,557,700.96 : x
2. Step 2: Convert to fraction form
   139,105,786.08/208,659,398.94 = 81,557,700.96/x
3. Step 3: Cross multiply
   139,105,786.08x = 208,659,398.94 × 81,557,700.96
4. Step 4: Simplify right side
   139,105,786.08x = 17,017,780,861,241,860
5. Step 5: Solve for x
   x = 17,017,780,861,241,860/139,105,786.08
6. Step 6: Final answer
   x = 122,336,973.47