Finding the Fourth Proportional to 6,220.53, 8,576.55 and 3,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,220.53 : 8,576.55 = 3,978.72 : x
2. Step 2: Convert to fraction form
   6,220.53/8,576.55 = 3,978.72/x
3. Step 3: Cross multiply
   6,220.53x = 8,576.55 × 3,978.72
4. Step 4: Simplify right side
   6,220.53x = 34,123,691.02
5. Step 5: Solve for x
   x = 34,123,691.02/6,220.53
6. Step 6: Final answer
   x = 5,485.66