Finding the Fourth Proportional to 22,401.72, 30,909.41 and 12,964.82

Step by Step Solution

1. Step 1: Write the proportion equation
   22,401.72 : 30,909.41 = 12,964.82 : x
2. Step 2: Convert to fraction form
   22,401.72/30,909.41 = 12,964.82/x
3. Step 3: Cross multiply
   22,401.72x = 30,909.41 × 12,964.82
4. Step 4: Simplify right side
   22,401.72x = 400,734,839.13
5. Step 5: Solve for x
   x = 400,734,839.13/22,401.72
6. Step 6: Final answer
   x = 17,888.57