Finding the Fourth Proportional to 2,611.42, 3,917.31 and 762.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.42 : 3,917.31 = 762.55 : x
2. Step 2: Convert to fraction form
   2,611.42/3,917.31 = 762.55/x
3. Step 3: Cross multiply
   2,611.42x = 3,917.31 × 762.55
4. Step 4: Simplify right side
   2,611.42x = 2,987,144.74
5. Step 5: Solve for x
   x = 2,987,144.74/2,611.42
6. Step 6: Final answer
   x = 1,143.88