Finding the Fourth Proportional to 9,609.12, 13,260.78 and 5,416.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,609.12 : 13,260.78 = 5,416.56 : x
2. Step 2: Convert to fraction form
   9,609.12/13,260.78 = 5,416.56/x
3. Step 3: Cross multiply
   9,609.12x = 13,260.78 × 5,416.56
4. Step 4: Simplify right side
   9,609.12x = 71,827,810.52
5. Step 5: Solve for x
   x = 71,827,810.52/9,609.12
6. Step 6: Final answer
   x = 7,474.96