Finding the Fourth Proportional to 2,558.96, 3,838.56 and 915.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.96 : 3,838.56 = 915.48 : x
2. Step 2: Convert to fraction form
   2,558.96/3,838.56 = 915.48/x
3. Step 3: Cross multiply
   2,558.96x = 3,838.56 × 915.48
4. Step 4: Simplify right side
   2,558.96x = 3,514,124.91
5. Step 5: Solve for x
   x = 3,514,124.91/2,558.96
6. Step 6: Final answer
   x = 1,373.26