Finding the Fourth Proportional to 7,127.68, 10,680.24 and 5,170.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,127.68 : 10,680.24 = 5,170.72 : x
2. Step 2: Convert to fraction form
   7,127.68/10,680.24 = 5,170.72/x
3. Step 3: Cross multiply
   7,127.68x = 10,680.24 × 5,170.72
4. Step 4: Simplify right side
   7,127.68x = 55,224,530.57
5. Step 5: Solve for x
   x = 55,224,530.57/7,127.68
6. Step 6: Final answer
   x = 7,747.90