Finding the Fourth Proportional to 2,605.90, 3,906.51 and 961.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.90 : 3,906.51 = 961.33 : x
2. Step 2: Convert to fraction form
   2,605.90/3,906.51 = 961.33/x
3. Step 3: Cross multiply
   2,605.90x = 3,906.51 × 961.33
4. Step 4: Simplify right side
   2,605.90x = 3,755,445.26
5. Step 5: Solve for x
   x = 3,755,445.26/2,605.90
6. Step 6: Final answer
   x = 1,441.13