Finding the Fourth Proportional to 2,147.50, 3,223.55 and 915.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.50 : 3,223.55 = 915.49 : x
2. Step 2: Convert to fraction form
   2,147.50/3,223.55 = 915.49/x
3. Step 3: Cross multiply
   2,147.50x = 3,223.55 × 915.49
4. Step 4: Simplify right side
   2,147.50x = 2,951,127.79
5. Step 5: Solve for x
   x = 2,951,127.79/2,147.50
6. Step 6: Final answer
   x = 1,374.22