Finding the Fourth Proportional to 2,479.50, 3,422.78 and 1,640.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,479.50 : 3,422.78 = 1,640.60 : x
2. Step 2: Convert to fraction form
   2,479.50/3,422.78 = 1,640.60/x
3. Step 3: Cross multiply
   2,479.50x = 3,422.78 × 1,640.60
4. Step 4: Simplify right side
   2,479.50x = 5,615,412.87
5. Step 5: Solve for x
   x = 5,615,412.87/2,479.50
6. Step 6: Final answer
   x = 2,264.74