Finding the Fourth Proportional to 10,861.30, 14,990.91 and 8,315.83

Step by Step Solution

1. Step 1: Write the proportion equation
   10,861.30 : 14,990.91 = 8,315.83 : x
2. Step 2: Convert to fraction form
   10,861.30/14,990.91 = 8,315.83/x
3. Step 3: Cross multiply
   10,861.30x = 14,990.91 × 8,315.83
4. Step 4: Simplify right side
   10,861.30x = 124,661,859.11
5. Step 5: Solve for x
   x = 124,661,859.11/10,861.30
6. Step 6: Final answer
   x = 11,477.62