Finding the Fourth Proportional to 2,890.78, 4,336.18 and 2,317.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,890.78 : 4,336.18 = 2,317.30 : x
2. Step 2: Convert to fraction form
   2,890.78/4,336.18 = 2,317.30/x
3. Step 3: Cross multiply
   2,890.78x = 4,336.18 × 2,317.30
4. Step 4: Simplify right side
   2,890.78x = 10,048,229.91
5. Step 5: Solve for x
   x = 10,048,229.91/2,890.78
6. Step 6: Final answer
   x = 3,475.96