Finding the Fourth Proportional to 9,414,231,728.64, 12,991,640,022.41 and 5,185,143,617.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,414,231,728.64 : 12,991,640,022.41 = 5,185,143,617.28 : x
2. Step 2: Convert to fraction form
   9,414,231,728.64/12,991,640,022.41 = 5,185,143,617.28/x
3. Step 3: Cross multiply
   9,414,231,728.64x = 12,991,640,022.41 × 5,185,143,617.28
4. Step 4: Simplify right side
   9,414,231,728.64x = 67,363,519,340,145,328,128
5. Step 5: Solve for x
   x = 67,363,519,340,145,328,128/9,414,231,728.64
6. Step 6: Final answer
   x = 7,155,498,322.31