Finding the Fourth Proportional to 9,615.64, 13,269.78 and 5,423.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,615.64 : 13,269.78 = 5,423.89 : x
2. Step 2: Convert to fraction form
   9,615.64/13,269.78 = 5,423.89/x
3. Step 3: Cross multiply
   9,615.64x = 13,269.78 × 5,423.89
4. Step 4: Simplify right side
   9,615.64x = 71,973,827.04
5. Step 5: Solve for x
   x = 71,973,827.04/9,615.64
6. Step 6: Final answer
   x = 7,485.08