Finding the Fourth Proportional to 2,639.01, 3,960.26 and 1,407.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.01 : 3,960.26 = 1,407.31 : x
2. Step 2: Convert to fraction form
   2,639.01/3,960.26 = 1,407.31/x
3. Step 3: Cross multiply
   2,639.01x = 3,960.26 × 1,407.31
4. Step 4: Simplify right side
   2,639.01x = 5,573,307.12
5. Step 5: Solve for x
   x = 5,573,307.12/2,639.01
6. Step 6: Final answer
   x = 2,111.89