Finding the Fourth Proportional to 6,391.74, 8,820.50 and 3,559.34

Step by Step Solution

1. Step 1: Write the proportion equation
   6,391.74 : 8,820.50 = 3,559.34 : x
2. Step 2: Convert to fraction form
   6,391.74/8,820.50 = 3,559.34/x
3. Step 3: Cross multiply
   6,391.74x = 8,820.50 × 3,559.34
4. Step 4: Simplify right side
   6,391.74x = 31,395,162.72
5. Step 5: Solve for x
   x = 31,395,162.72/6,391.74
6. Step 6: Final answer
   x = 4,911.84