Finding the Fourth Proportional to 9,409.72, 12,985.50 and 5,217.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,409.72 : 12,985.50 = 5,217.88 : x
2. Step 2: Convert to fraction form
   9,409.72/12,985.50 = 5,217.88/x
3. Step 3: Cross multiply
   9,409.72x = 12,985.50 × 5,217.88
4. Step 4: Simplify right side
   9,409.72x = 67,756,780.74
5. Step 5: Solve for x
   x = 67,756,780.74/9,409.72
6. Step 6: Final answer
   x = 7,200.72