Finding the Fourth Proportional to 9,613.44, 13,266.72 and 5,421.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,613.44 : 13,266.72 = 5,421.60 : x
2. Step 2: Convert to fraction form
   9,613.44/13,266.72 = 5,421.60/x
3. Step 3: Cross multiply
   9,613.44x = 13,266.72 × 5,421.60
4. Step 4: Simplify right side
   9,613.44x = 71,926,849.15
5. Step 5: Solve for x
   x = 71,926,849.15/9,613.44
6. Step 6: Final answer
   x = 7,481.91