Finding the Fourth Proportional to 2,612.25, 3,917.43 and 762.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612.25 : 3,917.43 = 762.89 : x
2. Step 2: Convert to fraction form
   2,612.25/3,917.43 = 762.89/x
3. Step 3: Cross multiply
   2,612.25x = 3,917.43 × 762.89
4. Step 4: Simplify right side
   2,612.25x = 2,988,548.59
5. Step 5: Solve for x
   x = 2,988,548.59/2,612.25
6. Step 6: Final answer
   x = 1,144.05