Finding the Fourth Proportional to 10,290.20, 15,432.06 and 5,909.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,290.20 : 15,432.06 = 5,909.72 : x
2. Step 2: Convert to fraction form
   10,290.20/15,432.06 = 5,909.72/x
3. Step 3: Cross multiply
   10,290.20x = 15,432.06 × 5,909.72
4. Step 4: Simplify right side
   10,290.20x = 91,199,153.62
5. Step 5: Solve for x
   x = 91,199,153.62/10,290.20
6. Step 6: Final answer
   x = 8,862.72