Finding the Fourth Proportional to 10,401.80, 14,281.90 and 10,131.08

Step by Step Solution

1. Step 1: Write the proportion equation
   10,401.80 : 14,281.90 = 10,131.08 : x
2. Step 2: Convert to fraction form
   10,401.80/14,281.90 = 10,131.08/x
3. Step 3: Cross multiply
   10,401.80x = 14,281.90 × 10,131.08
4. Step 4: Simplify right side
   10,401.80x = 144,691,071.45
5. Step 5: Solve for x
   x = 144,691,071.45/10,401.80
6. Step 6: Final answer
   x = 13,910.20