Finding the Fourth Proportional to 2,611.72, 3,917.69 and 762.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.72 : 3,917.69 = 762.79 : x
2. Step 2: Convert to fraction form
   2,611.72/3,917.69 = 762.79/x
3. Step 3: Cross multiply
   2,611.72x = 3,917.69 × 762.79
4. Step 4: Simplify right side
   2,611.72x = 2,988,384.52
5. Step 5: Solve for x
   x = 2,988,384.52/2,611.72
6. Step 6: Final answer
   x = 1,144.22