Finding the Fourth Proportional to 12,406.50, 18,613.26 and 5,009.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,406.50 : 18,613.26 = 5,009.31 : x
2. Step 2: Convert to fraction form
   12,406.50/18,613.26 = 5,009.31/x
3. Step 3: Cross multiply
   12,406.50x = 18,613.26 × 5,009.31
4. Step 4: Simplify right side
   12,406.50x = 93,239,589.45
5. Step 5: Solve for x
   x = 93,239,589.45/12,406.50
6. Step 6: Final answer
   x = 7,515.38