Finding the Fourth Proportional to 2,642.97, 3,960.96 and 1,407.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.97 : 3,960.96 = 1,407.72 : x
2. Step 2: Convert to fraction form
   2,642.97/3,960.96 = 1,407.72/x
3. Step 3: Cross multiply
   2,642.97x = 3,960.96 × 1,407.72
4. Step 4: Simplify right side
   2,642.97x = 5,575,915.57
5. Step 5: Solve for x
   x = 5,575,915.57/2,642.97
6. Step 6: Final answer
   x = 2,109.72