Finding the Fourth Proportional to 2,636.82, 3,962.42 and 1,405.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.82 : 3,962.42 = 1,405.12 : x
2. Step 2: Convert to fraction form
   2,636.82/3,962.42 = 1,405.12/x
3. Step 3: Cross multiply
   2,636.82x = 3,962.42 × 1,405.12
4. Step 4: Simplify right side
   2,636.82x = 5,567,675.59
5. Step 5: Solve for x
   x = 5,567,675.59/2,636.82
6. Step 6: Final answer
   x = 2,111.51