Finding the Fourth Proportional to 8,728.10, 13,085.76 and 2,801.61

Step by Step Solution

1. Step 1: Write the proportion equation
   8,728.10 : 13,085.76 = 2,801.61 : x
2. Step 2: Convert to fraction form
   8,728.10/13,085.76 = 2,801.61/x
3. Step 3: Cross multiply
   8,728.10x = 13,085.76 × 2,801.61
4. Step 4: Simplify right side
   8,728.10x = 36,661,196.07
5. Step 5: Solve for x
   x = 36,661,196.07/8,728.10
6. Step 6: Final answer
   x = 4,200.37