Finding the Fourth Proportional to 99,613,728.60, 137,414,667.42 and 81,049,630.20

Step by Step Solution

1. Step 1: Write the proportion equation
   99,613,728.60 : 137,414,667.42 = 81,049,630.20 : x
2. Step 2: Convert to fraction form
   99,613,728.60/137,414,667.42 = 81,049,630.20/x
3. Step 3: Cross multiply
   99,613,728.60x = 137,414,667.42 × 81,049,630.20
4. Step 4: Simplify right side
   99,613,728.60x = 11,137,407,978,446,988
5. Step 5: Solve for x
   x = 11,137,407,978,446,988/99,613,728.60
6. Step 6: Final answer
   x = 111,805,954.21