Finding the Fourth Proportional to 3,861.78, 5,329.91 and 2,290.17

Step by Step Solution

1. Step 1: Write the proportion equation
   3,861.78 : 5,329.91 = 2,290.17 : x
2. Step 2: Convert to fraction form
   3,861.78/5,329.91 = 2,290.17/x
3. Step 3: Cross multiply
   3,861.78x = 5,329.91 × 2,290.17
4. Step 4: Simplify right side
   3,861.78x = 12,206,388.53
5. Step 5: Solve for x
   x = 12,206,388.53/3,861.78
6. Step 6: Final answer
   x = 3,160.82