Finding the Fourth Proportional to 21,684,128.72, 29,923,815.29 and 12,391,593.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,684,128.72 : 29,923,815.29 = 12,391,593.06 : x
2. Step 2: Convert to fraction form
   21,684,128.72/29,923,815.29 = 12,391,593.06/x
3. Step 3: Cross multiply
   21,684,128.72x = 29,923,815.29 × 12,391,593.06
4. Step 4: Simplify right side
   21,684,128.72x = 370,803,741,814,327.94
5. Step 5: Solve for x
   x = 370,803,741,814,327.94/21,684,128.72
6. Step 6: Final answer
   x = 17,100,237.08