Finding the Fourth Proportional to 87,691,111.20, 122,969,109.60 and 87,691,111.20

Step by Step Solution

1. Step 1: Write the proportion equation
   87,691,111.20 : 122,969,109.60 = 87,691,111.20 : x
2. Step 2: Convert to fraction form
   87,691,111.20/122,969,109.60 = 87,691,111.20/x
3. Step 3: Cross multiply
   87,691,111.20x = 122,969,109.60 × 87,691,111.20
4. Step 4: Simplify right side
   87,691,111.20x = 10,783,297,864,098,588
5. Step 5: Solve for x
   x = 10,783,297,864,098,588/87,691,111.20
6. Step 6: Final answer
   x = 122,969,109.60