Finding the Fourth Proportional to 9,669.28, 13,344.71 and 5,421.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,669.28 : 13,344.71 = 5,421.49 : x
2. Step 2: Convert to fraction form
   9,669.28/13,344.71 = 5,421.49/x
3. Step 3: Cross multiply
   9,669.28x = 13,344.71 × 5,421.49
4. Step 4: Simplify right side
   9,669.28x = 72,348,211.82
5. Step 5: Solve for x
   x = 72,348,211.82/9,669.28
6. Step 6: Final answer
   x = 7,482.27