Finding the Fourth Proportional to 5,145.60, 7,098.72 and 3,964.80

Step by Step Solution

1. Step 1: Write the proportion equation
   5,145.60 : 7,098.72 = 3,964.80 : x
2. Step 2: Convert to fraction form
   5,145.60/7,098.72 = 3,964.80/x
3. Step 3: Cross multiply
   5,145.60x = 7,098.72 × 3,964.80
4. Step 4: Simplify right side
   5,145.60x = 28,145,005.06
5. Step 5: Solve for x
   x = 28,145,005.06/5,145.60
6. Step 6: Final answer
   x = 5,469.72