Finding the Fourth Proportional to 3,915.83, 5,403.81 and 2,147.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.83 : 5,403.81 = 2,147.40 : x
2. Step 2: Convert to fraction form
   3,915.83/5,403.81 = 2,147.40/x
3. Step 3: Cross multiply
   3,915.83x = 5,403.81 × 2,147.40
4. Step 4: Simplify right side
   3,915.83x = 11,604,141.59
5. Step 5: Solve for x
   x = 11,604,141.59/3,915.83
6. Step 6: Final answer
   x = 2,963.39