Finding the Fourth Proportional to 8,085.29, 12,127.90 and 2,538.61

Step by Step Solution

1. Step 1: Write the proportion equation
   8,085.29 : 12,127.90 = 2,538.61 : x
2. Step 2: Convert to fraction form
   8,085.29/12,127.90 = 2,538.61/x
3. Step 3: Cross multiply
   8,085.29x = 12,127.90 × 2,538.61
4. Step 4: Simplify right side
   8,085.29x = 30,788,008.22
5. Step 5: Solve for x
   x = 30,788,008.22/8,085.29
6. Step 6: Final answer
   x = 3,807.90