Finding the Fourth Proportional to 9,401.20, 14,061.30 and 8,421.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,401.20 : 14,061.30 = 8,421.10 : x
2. Step 2: Convert to fraction form
   9,401.20/14,061.30 = 8,421.10/x
3. Step 3: Cross multiply
   9,401.20x = 14,061.30 × 8,421.10
4. Step 4: Simplify right side
   9,401.20x = 118,411,613.43
5. Step 5: Solve for x
   x = 118,411,613.43/9,401.20
6. Step 6: Final answer
   x = 12,595.37