Finding the Fourth Proportional to 9,002.72, 12,421.77 and 5,223.70

Step by Step Solution

1. Step 1: Write the proportion equation
   9,002.72 : 12,421.77 = 5,223.70 : x
2. Step 2: Convert to fraction form
   9,002.72/12,421.77 = 5,223.70/x
3. Step 3: Cross multiply
   9,002.72x = 12,421.77 × 5,223.70
4. Step 4: Simplify right side
   9,002.72x = 64,887,537.84
5. Step 5: Solve for x
   x = 64,887,537.84/9,002.72
6. Step 6: Final answer
   x = 7,207.55