Finding the Fourth Proportional to 8,078.90, 12,120.69 and 2,885.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,078.90 : 12,120.69 = 2,885.18 : x
2. Step 2: Convert to fraction form
   8,078.90/12,120.69 = 2,885.18/x
3. Step 3: Cross multiply
   8,078.90x = 12,120.69 × 2,885.18
4. Step 4: Simplify right side
   8,078.90x = 34,970,372.37
5. Step 5: Solve for x
   x = 34,970,372.37/8,078.90
6. Step 6: Final answer
   x = 4,328.61