Finding the Fourth Proportional to 2,641.78, 3,962.70 and 910.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.78 : 3,962.70 = 910.42 : x
2. Step 2: Convert to fraction form
   2,641.78/3,962.70 = 910.42/x
3. Step 3: Cross multiply
   2,641.78x = 3,962.70 × 910.42
4. Step 4: Simplify right side
   2,641.78x = 3,607,721.33
5. Step 5: Solve for x
   x = 3,607,721.33/2,641.78
6. Step 6: Final answer
   x = 1,365.64