Finding the Fourth Proportional to 10,290.06, 15,401.26 and 7,811.24

Step by Step Solution

1. Step 1: Write the proportion equation
   10,290.06 : 15,401.26 = 7,811.24 : x
2. Step 2: Convert to fraction form
   10,290.06/15,401.26 = 7,811.24/x
3. Step 3: Cross multiply
   10,290.06x = 15,401.26 × 7,811.24
4. Step 4: Simplify right side
   10,290.06x = 120,302,892.89
5. Step 5: Solve for x
   x = 120,302,892.89/10,290.06
6. Step 6: Final answer
   x = 11,691.17