Finding the Fourth Proportional to 12,820.24, 17,690.96 and 7,154.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.24 : 17,690.96 = 7,154.56 : x
2. Step 2: Convert to fraction form
   12,820.24/17,690.96 = 7,154.56/x
3. Step 3: Cross multiply
   12,820.24x = 17,690.96 × 7,154.56
4. Step 4: Simplify right side
   12,820.24x = 126,571,034.78
5. Step 5: Solve for x
   x = 126,571,034.78/12,820.24
6. Step 6: Final answer
   x = 9,872.75