Finding the Fourth Proportional to 6,478.20, 8,939.72 and 3,645.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,478.20 : 8,939.72 = 3,645.72 : x
2. Step 2: Convert to fraction form
   6,478.20/8,939.72 = 3,645.72/x
3. Step 3: Cross multiply
   6,478.20x = 8,939.72 × 3,645.72
4. Step 4: Simplify right side
   6,478.20x = 32,591,697.77
5. Step 5: Solve for x
   x = 32,591,697.77/6,478.20
6. Step 6: Final answer
   x = 5,030.98