Finding the Fourth Proportional to 2,559.15, 3,838.17 and 915.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.15 : 3,838.17 = 915.81 : x
2. Step 2: Convert to fraction form
   2,559.15/3,838.17 = 915.81/x
3. Step 3: Cross multiply
   2,559.15x = 3,838.17 × 915.81
4. Step 4: Simplify right side
   2,559.15x = 3,515,034.47
5. Step 5: Solve for x
   x = 3,515,034.47/2,559.15
6. Step 6: Final answer
   x = 1,373.52