Finding the Fourth Proportional to 8,328.66, 12,488.85 and 2,780.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,328.66 : 12,488.85 = 2,780.10 : x
2. Step 2: Convert to fraction form
   8,328.66/12,488.85 = 2,780.10/x
3. Step 3: Cross multiply
   8,328.66x = 12,488.85 × 2,780.10
4. Step 4: Simplify right side
   8,328.66x = 34,720,251.89
5. Step 5: Solve for x
   x = 34,720,251.89/8,328.66
6. Step 6: Final answer
   x = 4,168.77