Finding the Fourth Proportional to 8,081.78, 12,122.59 and 2,816.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,081.78 : 12,122.59 = 2,816.78 : x
2. Step 2: Convert to fraction form
   8,081.78/12,122.59 = 2,816.78/x
3. Step 3: Cross multiply
   8,081.78x = 12,122.59 × 2,816.78
4. Step 4: Simplify right side
   8,081.78x = 34,146,669.06
5. Step 5: Solve for x
   x = 34,146,669.06/8,081.78
6. Step 6: Final answer
   x = 4,225.14