Finding the Fourth Proportional to 2,558.64, 3,838.47 and 915.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.64 : 3,838.47 = 915.42 : x
2. Step 2: Convert to fraction form
   2,558.64/3,838.47 = 915.42/x
3. Step 3: Cross multiply
   2,558.64x = 3,838.47 × 915.42
4. Step 4: Simplify right side
   2,558.64x = 3,513,812.21
5. Step 5: Solve for x
   x = 3,513,812.21/2,558.64
6. Step 6: Final answer
   x = 1,373.31