Finding the Fourth Proportional to 10,085.10, 15,128.15 and 2,689.63

Step by Step Solution

1. Step 1: Write the proportion equation
   10,085.10 : 15,128.15 = 2,689.63 : x
2. Step 2: Convert to fraction form
   10,085.10/15,128.15 = 2,689.63/x
3. Step 3: Cross multiply
   10,085.10x = 15,128.15 × 2,689.63
4. Step 4: Simplify right side
   10,085.10x = 40,689,037.00
5. Step 5: Solve for x
   x = 40,689,037.00/10,085.10
6. Step 6: Final answer
   x = 4,034.57