Finding the Fourth Proportional to 6,498.56, 8,964.80 and 3,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   6,498.56 : 8,964.80 = 3,978.56 : x
2. Step 2: Convert to fraction form
   6,498.56/8,964.80 = 3,978.56/x
3. Step 3: Cross multiply
   6,498.56x = 8,964.80 × 3,978.56
4. Step 4: Simplify right side
   6,498.56x = 35,666,994.69
5. Step 5: Solve for x
   x = 35,666,994.69/6,498.56
6. Step 6: Final answer
   x = 5,488.45