Finding the Fourth Proportional to 6,505.96, 8,978.18 and 3,521.80

Step by Step Solution

1. Step 1: Write the proportion equation
   6,505.96 : 8,978.18 = 3,521.80 : x
2. Step 2: Convert to fraction form
   6,505.96/8,978.18 = 3,521.80/x
3. Step 3: Cross multiply
   6,505.96x = 8,978.18 × 3,521.80
4. Step 4: Simplify right side
   6,505.96x = 31,619,354.32
5. Step 5: Solve for x
   x = 31,619,354.32/6,505.96
6. Step 6: Final answer
   x = 4,860.06