Finding the Fourth Proportional to 2,764.80, 4,145.61 and 915.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,764.80 : 4,145.61 = 915.39 : x
2. Step 2: Convert to fraction form
   2,764.80/4,145.61 = 915.39/x
3. Step 3: Cross multiply
   2,764.80x = 4,145.61 × 915.39
4. Step 4: Simplify right side
   2,764.80x = 3,794,849.94
5. Step 5: Solve for x
   x = 3,794,849.94/2,764.80
6. Step 6: Final answer
   x = 1,372.56