Finding the Fourth Proportional to 9,665.34, 13,336.20 and 5,472.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,665.34 : 13,336.20 = 5,472.78 : x
2. Step 2: Convert to fraction form
   9,665.34/13,336.20 = 5,472.78/x
3. Step 3: Cross multiply
   9,665.34x = 13,336.20 × 5,472.78
4. Step 4: Simplify right side
   9,665.34x = 72,986,088.64
5. Step 5: Solve for x
   x = 72,986,088.64/9,665.34
6. Step 6: Final answer
   x = 7,551.32