Finding the Fourth Proportional to 2,558.61, 3,838.28 and 915.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.61 : 3,838.28 = 915.62 : x
2. Step 2: Convert to fraction form
   2,558.61/3,838.28 = 915.62/x
3. Step 3: Cross multiply
   2,558.61x = 3,838.28 × 915.62
4. Step 4: Simplify right side
   2,558.61x = 3,514,382.16
5. Step 5: Solve for x
   x = 3,514,382.16/2,558.61
6. Step 6: Final answer
   x = 1,373.55