Finding the Fourth Proportional to 2,559.06, 3,839.20 and 915.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.06 : 3,839.20 = 915.48 : x
2. Step 2: Convert to fraction form
   2,559.06/3,839.20 = 915.48/x
3. Step 3: Cross multiply
   2,559.06x = 3,839.20 × 915.48
4. Step 4: Simplify right side
   2,559.06x = 3,514,710.82
5. Step 5: Solve for x
   x = 3,514,710.82/2,559.06
6. Step 6: Final answer
   x = 1,373.44