Finding the Fourth Proportional to 2,642.63, 3,965.76 and 911.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.63 : 3,965.76 = 911.25 : x
2. Step 2: Convert to fraction form
   2,642.63/3,965.76 = 911.25/x
3. Step 3: Cross multiply
   2,642.63x = 3,965.76 × 911.25
4. Step 4: Simplify right side
   2,642.63x = 3,613,798.80
5. Step 5: Solve for x
   x = 3,613,798.80/2,642.63
6. Step 6: Final answer
   x = 1,367.50