Finding the Fourth Proportional to 2,558.31, 3,837.78 and 915.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.31 : 3,837.78 = 915.03 : x
2. Step 2: Convert to fraction form
   2,558.31/3,837.78 = 915.03/x
3. Step 3: Cross multiply
   2,558.31x = 3,837.78 × 915.03
4. Step 4: Simplify right side
   2,558.31x = 3,511,683.83
5. Step 5: Solve for x
   x = 3,511,683.83/2,558.31
6. Step 6: Final answer
   x = 1,372.66