Finding the Fourth Proportional to 10,128.72, 15,195.76 and 4,285.52

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.72 : 15,195.76 = 4,285.52 : x
2. Step 2: Convert to fraction form
   10,128.72/15,195.76 = 4,285.52/x
3. Step 3: Cross multiply
   10,128.72x = 15,195.76 × 4,285.52
4. Step 4: Simplify right side
   10,128.72x = 65,121,733.40
5. Step 5: Solve for x
   x = 65,121,733.40/10,128.72
6. Step 6: Final answer
   x = 6,429.41