Finding the Fourth Proportional to 6,391.72, 8,820.50 and 3,559.06

Step by Step Solution

1. Step 1: Write the proportion equation
   6,391.72 : 8,820.50 = 3,559.06 : x
2. Step 2: Convert to fraction form
   6,391.72/8,820.50 = 3,559.06/x
3. Step 3: Cross multiply
   6,391.72x = 8,820.50 × 3,559.06
4. Step 4: Simplify right side
   6,391.72x = 31,392,673.47
5. Step 5: Solve for x
   x = 31,392,673.47/6,391.72
6. Step 6: Final answer
   x = 4,911.46