Finding the Fourth Proportional to 5,642.72, 8,477.17 and 3,540.80

Step by Step Solution

1. Step 1: Write the proportion equation
   5,642.72 : 8,477.17 = 3,540.80 : x
2. Step 2: Convert to fraction form
   5,642.72/8,477.17 = 3,540.80/x
3. Step 3: Cross multiply
   5,642.72x = 8,477.17 × 3,540.80
4. Step 4: Simplify right side
   5,642.72x = 30,015,963.54
5. Step 5: Solve for x
   x = 30,015,963.54/5,642.72
6. Step 6: Final answer
   x = 5,319.41