Finding the Fourth Proportional to 7,199.48, 9,939.81 and 5,517.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,199.48 : 9,939.81 = 5,517.72 : x
2. Step 2: Convert to fraction form
   7,199.48/9,939.81 = 5,517.72/x
3. Step 3: Cross multiply
   7,199.48x = 9,939.81 × 5,517.72
4. Step 4: Simplify right side
   7,199.48x = 54,845,109.12
5. Step 5: Solve for x
   x = 54,845,109.12/7,199.48
6. Step 6: Final answer
   x = 7,617.92