Finding the Fourth Proportional to 8,085.06, 12,128.40 and 2,891.34

Step by Step Solution

1. Step 1: Write the proportion equation
   8,085.06 : 12,128.40 = 2,891.34 : x
2. Step 2: Convert to fraction form
   8,085.06/12,128.40 = 2,891.34/x
3. Step 3: Cross multiply
   8,085.06x = 12,128.40 × 2,891.34
4. Step 4: Simplify right side
   8,085.06x = 35,067,328.06
5. Step 5: Solve for x
   x = 35,067,328.06/8,085.06
6. Step 6: Final answer
   x = 4,337.30