Finding the Fourth Proportional to 9,002.31, 12,421.20 and 5,223.29

Step by Step Solution

1. Step 1: Write the proportion equation
   9,002.31 : 12,421.20 = 5,223.29 : x
2. Step 2: Convert to fraction form
   9,002.31/12,421.20 = 5,223.29/x
3. Step 3: Cross multiply
   9,002.31x = 12,421.20 × 5,223.29
4. Step 4: Simplify right side
   9,002.31x = 64,879,441.53
5. Step 5: Solve for x
   x = 64,879,441.53/9,002.31
6. Step 6: Final answer
   x = 7,206.98