Finding the Fourth Proportional to 14,777.12, 20,389.43 and 9,401.69

Step by Step Solution

1. Step 1: Write the proportion equation
   14,777.12 : 20,389.43 = 9,401.69 : x
2. Step 2: Convert to fraction form
   14,777.12/20,389.43 = 9,401.69/x
3. Step 3: Cross multiply
   14,777.12x = 20,389.43 × 9,401.69
4. Step 4: Simplify right side
   14,777.12x = 191,695,021.69
5. Step 5: Solve for x
   x = 191,695,021.69/14,777.12
6. Step 6: Final answer
   x = 12,972.43