Finding the Fourth Proportional to 21,398,981.52, 29,530,591.02 and 12,231,821.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,398,981.52 : 29,530,591.02 = 12,231,821.10 : x
2. Step 2: Convert to fraction form
   21,398,981.52/29,530,591.02 = 12,231,821.10/x
3. Step 3: Cross multiply
   21,398,981.52x = 29,530,591.02 × 12,231,821.10
4. Step 4: Simplify right side
   21,398,981.52x = 361,212,906,333,906.50
5. Step 5: Solve for x
   x = 361,212,906,333,906.50/21,398,981.52
6. Step 6: Final answer
   x = 16,879,911.13