Finding the Fourth Proportional to 2,559.72, 3,838.68 and 915.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.72 : 3,838.68 = 915.96 : x
2. Step 2: Convert to fraction form
   2,559.72/3,838.68 = 915.96/x
3. Step 3: Cross multiply
   2,559.72x = 3,838.68 × 915.96
4. Step 4: Simplify right side
   2,559.72x = 3,516,077.33
5. Step 5: Solve for x
   x = 3,516,077.33/2,559.72
6. Step 6: Final answer
   x = 1,373.62