Finding the Fourth Proportional to 1,554.12, 2,144.55 and 915.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.12 : 2,144.55 = 915.96 : x
2. Step 2: Convert to fraction form
   1,554.12/2,144.55 = 915.96/x
3. Step 3: Cross multiply
   1,554.12x = 2,144.55 × 915.96
4. Step 4: Simplify right side
   1,554.12x = 1,964,306.72
5. Step 5: Solve for x
   x = 1,964,306.72/1,554.12
6. Step 6: Final answer
   x = 1,263.94