Finding the Fourth Proportional to 2,638.92, 3,955.52 and 1,405.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.92 : 3,955.52 = 1,405.08 : x
2. Step 2: Convert to fraction form
   2,638.92/3,955.52 = 1,405.08/x
3. Step 3: Cross multiply
   2,638.92x = 3,955.52 × 1,405.08
4. Step 4: Simplify right side
   2,638.92x = 5,557,815.02
5. Step 5: Solve for x
   x = 5,557,815.02/2,638.92
6. Step 6: Final answer
   x = 2,106.09