Finding the Fourth Proportional to 2,630.70, 3,921.46 and 2,590.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.70 : 3,921.46 = 2,590.61 : x
2. Step 2: Convert to fraction form
   2,630.70/3,921.46 = 2,590.61/x
3. Step 3: Cross multiply
   2,630.70x = 3,921.46 × 2,590.61
4. Step 4: Simplify right side
   2,630.70x = 10,158,947.41
5. Step 5: Solve for x
   x = 10,158,947.41/2,630.70
6. Step 6: Final answer
   x = 3,861.69