Finding the Fourth Proportional to 2,640.92, 3,957.06 and 1,407.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.92 : 3,957.06 = 1,407.02 : x
2. Step 2: Convert to fraction form
   2,640.92/3,957.06 = 1,407.02/x
3. Step 3: Cross multiply
   2,640.92x = 3,957.06 × 1,407.02
4. Step 4: Simplify right side
   2,640.92x = 5,567,662.56
5. Step 5: Solve for x
   x = 5,567,662.56/2,640.92
6. Step 6: Final answer
   x = 2,108.23