Finding the Fourth Proportional to 2,609.77, 3,915.31 and 760.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.77 : 3,915.31 = 760.89 : x
2. Step 2: Convert to fraction form
   2,609.77/3,915.31 = 760.89/x
3. Step 3: Cross multiply
   2,609.77x = 3,915.31 × 760.89
4. Step 4: Simplify right side
   2,609.77x = 2,979,136.57
5. Step 5: Solve for x
   x = 2,979,136.57/2,609.77
6. Step 6: Final answer
   x = 1,141.53