Finding the Fourth Proportional to 8,328.82, 12,489.01 and 2,780.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,328.82 : 12,489.01 = 2,780.18 : x
2. Step 2: Convert to fraction form
   8,328.82/12,489.01 = 2,780.18/x
3. Step 3: Cross multiply
   8,328.82x = 12,489.01 × 2,780.18
4. Step 4: Simplify right side
   8,328.82x = 34,721,695.82
5. Step 5: Solve for x
   x = 34,721,695.82/8,328.82
6. Step 6: Final answer
   x = 4,168.86