Finding the Fourth Proportional to 14,128.56, 21,170.76 and 5,358.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,128.56 : 21,170.76 = 5,358.72 : x
2. Step 2: Convert to fraction form
   14,128.56/21,170.76 = 5,358.72/x
3. Step 3: Cross multiply
   14,128.56x = 21,170.76 × 5,358.72
4. Step 4: Simplify right side
   14,128.56x = 113,448,175.03
5. Step 5: Solve for x
   x = 113,448,175.03/14,128.56
6. Step 6: Final answer
   x = 8,029.71