Finding the Fourth Proportional to 9,649.91, 13,320.15 and 5,672.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,649.91 : 13,320.15 = 5,672.20 : x
2. Step 2: Convert to fraction form
   9,649.91/13,320.15 = 5,672.20/x
3. Step 3: Cross multiply
   9,649.91x = 13,320.15 × 5,672.20
4. Step 4: Simplify right side
   9,649.91x = 75,554,488.23
5. Step 5: Solve for x
   x = 75,554,488.23/9,649.91
6. Step 6: Final answer
   x = 7,829.56