Finding the Fourth Proportional to 21,398,978.52, 29,530,586.88 and 12,231,818.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,398,978.52 : 29,530,586.88 = 12,231,818.10 : x
2. Step 2: Convert to fraction form
   21,398,978.52/29,530,586.88 = 12,231,818.10/x
3. Step 3: Cross multiply
   21,398,978.52x = 29,530,586.88 × 12,231,818.10
4. Step 4: Simplify right side
   21,398,978.52x = 361,212,767,102,406.50
5. Step 5: Solve for x
   x = 361,212,767,102,406.50/21,398,978.52
6. Step 6: Final answer
   x = 16,879,906.99