Finding the Fourth Proportional to 14,152.41, 21,222.50 and 7,128.09

Step by Step Solution

1. Step 1: Write the proportion equation
   14,152.41 : 21,222.50 = 7,128.09 : x
2. Step 2: Convert to fraction form
   14,152.41/21,222.50 = 7,128.09/x
3. Step 3: Cross multiply
   14,152.41x = 21,222.50 × 7,128.09
4. Step 4: Simplify right side
   14,152.41x = 151,275,854.38
5. Step 5: Solve for x
   x = 151,275,854.38/14,152.41
6. Step 6: Final answer
   x = 10,689.05