Finding the Fourth Proportional to 2,610.42, 3,915.81 and 761.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.42 : 3,915.81 = 761.55 : x
2. Step 2: Convert to fraction form
   2,610.42/3,915.81 = 761.55/x
3. Step 3: Cross multiply
   2,610.42x = 3,915.81 × 761.55
4. Step 4: Simplify right side
   2,610.42x = 2,982,085.11
5. Step 5: Solve for x
   x = 2,982,085.11/2,610.42
6. Step 6: Final answer
   x = 1,142.38