Finding the Fourth Proportional to 8,085.83, 12,128.72 and 2,539.65

Step by Step Solution

1. Step 1: Write the proportion equation
   8,085.83 : 12,128.72 = 2,539.65 : x
2. Step 2: Convert to fraction form
   8,085.83/12,128.72 = 2,539.65/x
3. Step 3: Cross multiply
   8,085.83x = 12,128.72 × 2,539.65
4. Step 4: Simplify right side
   8,085.83x = 30,802,691.05
5. Step 5: Solve for x
   x = 30,802,691.05/8,085.83
6. Step 6: Final answer
   x = 3,809.47