Finding the Fourth Proportional to 21,391,816.91, 29,521,375.59 and 12,099,205.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,391,816.91 : 29,521,375.59 = 12,099,205.15 : x
2. Step 2: Convert to fraction form
   21,391,816.91/29,521,375.59 = 12,099,205.15/x
3. Step 3: Cross multiply
   21,391,816.91x = 29,521,375.59 × 12,099,205.15
4. Step 4: Simplify right side
   21,391,816.91x = 357,185,179,499,808.88
5. Step 5: Solve for x
   x = 357,185,179,499,808.88/21,391,816.91
6. Step 6: Final answer
   x = 16,697,281.07