Finding the Fourth Proportional to 13,137,191,993.96, 18,128,383,769.56 and 7,711,947,887.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,137,191,993.96 : 18,128,383,769.56 = 7,711,947,887.20 : x
2. Step 2: Convert to fraction form
   13,137,191,993.96/18,128,383,769.56 = 7,711,947,887.20/x
3. Step 3: Cross multiply
   13,137,191,993.96x = 18,128,383,769.56 × 7,711,947,887.20
4. Step 4: Simplify right side
   13,137,191,993.96x = 139,805,150,910,009,016,320
5. Step 5: Solve for x
   x = 139,805,150,910,009,016,320/13,137,191,993.96
6. Step 6: Final answer
   x = 10,641,935,580.62