Finding the Fourth Proportional to 2,639.03, 3,960.32 and 1,407.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.03 : 3,960.32 = 1,407.29 : x
2. Step 2: Convert to fraction form
   2,639.03/3,960.32 = 1,407.29/x
3. Step 3: Cross multiply
   2,639.03x = 3,960.32 × 1,407.29
4. Step 4: Simplify right side
   2,639.03x = 5,573,321.60
5. Step 5: Solve for x
   x = 5,573,321.60/2,639.03
6. Step 6: Final answer
   x = 2,111.88