Finding the Fourth Proportional to 6,499.20, 8,968.56 and 3,985.56

Step by Step Solution

1. Step 1: Write the proportion equation
   6,499.20 : 8,968.56 = 3,985.56 : x
2. Step 2: Convert to fraction form
   6,499.20/8,968.56 = 3,985.56/x
3. Step 3: Cross multiply
   6,499.20x = 8,968.56 × 3,985.56
4. Step 4: Simplify right side
   6,499.20x = 35,744,733.99
5. Step 5: Solve for x
   x = 35,744,733.99/6,499.20
6. Step 6: Final answer
   x = 5,499.87