Finding the Fourth Proportional to 2,559.09, 3,838.69 and 915.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.09 : 3,838.69 = 915.60 : x
2. Step 2: Convert to fraction form
   2,559.09/3,838.69 = 915.60/x
3. Step 3: Cross multiply
   2,559.09x = 3,838.69 × 915.60
4. Step 4: Simplify right side
   2,559.09x = 3,514,720.10
5. Step 5: Solve for x
   x = 3,514,720.10/2,559.09
6. Step 6: Final answer
   x = 1,373.42