Finding the Fourth Proportional to 6,505.91, 8,978.13 and 3,521.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,505.91 : 8,978.13 = 3,521.72 : x
2. Step 2: Convert to fraction form
   6,505.91/8,978.13 = 3,521.72/x
3. Step 3: Cross multiply
   6,505.91x = 8,978.13 × 3,521.72
4. Step 4: Simplify right side
   6,505.91x = 31,618,459.98
5. Step 5: Solve for x
   x = 31,618,459.98/6,505.91
6. Step 6: Final answer
   x = 4,859.96