Finding the Fourth Proportional to 13,260,665.80, 18,288,801.30 and 7,822,909

Step by Step Solution

1. Step 1: Write the proportion equation
   13,260,665.80 : 18,288,801.30 = 7,822,909 : x
2. Step 2: Convert to fraction form
   13,260,665.80/18,288,801.30 = 7,822,909/x
3. Step 3: Cross multiply
   13,260,665.80x = 18,288,801.30 × 7,822,909
4. Step 4: Simplify right side
   13,260,665.80x = 143,071,628,288,981.72
5. Step 5: Solve for x
   x = 143,071,628,288,981.72/13,260,665.80
6. Step 6: Final answer
   x = 10,789,173.82