Finding the Fourth Proportional to 9,000.72, 12,418.92 and 5,222.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,000.72 : 12,418.92 = 5,222.88 : x
2. Step 2: Convert to fraction form
   9,000.72/12,418.92 = 5,222.88/x
3. Step 3: Cross multiply
   9,000.72x = 12,418.92 × 5,222.88
4. Step 4: Simplify right side
   9,000.72x = 64,862,528.89
5. Step 5: Solve for x
   x = 64,862,528.89/9,000.72
6. Step 6: Final answer
   x = 7,206.37