Finding the Fourth Proportional to 3,915.54, 5,403.43 and 2,147.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.54 : 5,403.43 = 2,147.15 : x
2. Step 2: Convert to fraction form
   3,915.54/5,403.43 = 2,147.15/x
3. Step 3: Cross multiply
   3,915.54x = 5,403.43 × 2,147.15
4. Step 4: Simplify right side
   3,915.54x = 11,601,942.34
5. Step 5: Solve for x
   x = 11,601,942.34/3,915.54
6. Step 6: Final answer
   x = 2,963.05