Finding the Fourth Proportional to 2,640.72, 3,958.64 and 2,422.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.72 : 3,958.64 = 2,422.02 : x
2. Step 2: Convert to fraction form
   2,640.72/3,958.64 = 2,422.02/x
3. Step 3: Cross multiply
   2,640.72x = 3,958.64 × 2,422.02
4. Step 4: Simplify right side
   2,640.72x = 9,587,905.25
5. Step 5: Solve for x
   x = 9,587,905.25/2,640.72
6. Step 6: Final answer
   x = 3,630.79