Finding the Fourth Proportional to 10,406.90, 15,530.24 and 8,317.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,406.90 : 15,530.24 = 8,317.10 : x
2. Step 2: Convert to fraction form
   10,406.90/15,530.24 = 8,317.10/x
3. Step 3: Cross multiply
   10,406.90x = 15,530.24 × 8,317.10
4. Step 4: Simplify right side
   10,406.90x = 129,166,559.10
5. Step 5: Solve for x
   x = 129,166,559.10/10,406.90
6. Step 6: Final answer
   x = 12,411.63