Finding the Fourth Proportional to 142,128,099.72, 196,138,129.68 and 83,391,764.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,128,099.72 : 196,138,129.68 = 83,391,764.10 : x
2. Step 2: Convert to fraction form
   142,128,099.72/196,138,129.68 = 83,391,764.10/x
3. Step 3: Cross multiply
   142,128,099.72x = 196,138,129.68 × 83,391,764.10
4. Step 4: Simplify right side
   142,128,099.72x = 16,356,304,641,289,768
5. Step 5: Solve for x
   x = 16,356,304,641,289,768/142,128,099.72
6. Step 6: Final answer
   x = 115,081,427.76