Finding the Fourth Proportional to 2,638.84, 3,956.91 and 1,406.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.84 : 3,956.91 = 1,406.92 : x
2. Step 2: Convert to fraction form
   2,638.84/3,956.91 = 1,406.92/x
3. Step 3: Cross multiply
   2,638.84x = 3,956.91 × 1,406.92
4. Step 4: Simplify right side
   2,638.84x = 5,567,055.82
5. Step 5: Solve for x
   x = 5,567,055.82/2,638.84
6. Step 6: Final answer
   x = 2,109.66