Finding the Fourth Proportional to 8,399.60, 12,574.56 and 5,102.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,399.60 : 12,574.56 = 5,102.72 : x
2. Step 2: Convert to fraction form
   8,399.60/12,574.56 = 5,102.72/x
3. Step 3: Cross multiply
   8,399.60x = 12,574.56 × 5,102.72
4. Step 4: Simplify right side
   8,399.60x = 64,164,458.80
5. Step 5: Solve for x
   x = 64,164,458.80/8,399.60
6. Step 6: Final answer
   x = 7,638.99