Finding the Fourth Proportional to 21,315,826.72, 29,415,112.96 and 12,151,421.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,315,826.72 : 29,415,112.96 = 12,151,421.92 : x
2. Step 2: Convert to fraction form
   21,315,826.72/29,415,112.96 = 12,151,421.92/x
3. Step 3: Cross multiply
   21,315,826.72x = 29,415,112.96 × 12,151,421.92
4. Step 4: Simplify right side
   21,315,826.72x = 357,435,448,401,420.06
5. Step 5: Solve for x
   x = 357,435,448,401,420.06/21,315,826.72
6. Step 6: Final answer
   x = 16,768,547.29