Finding the Fourth Proportional to 3,915.50, 5,403.39 and 2,259.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.50 : 5,403.39 = 2,259.50 : x
2. Step 2: Convert to fraction form
   3,915.50/5,403.39 = 2,259.50/x
3. Step 3: Cross multiply
   3,915.50x = 5,403.39 × 2,259.50
4. Step 4: Simplify right side
   3,915.50x = 12,208,959.71
5. Step 5: Solve for x
   x = 12,208,959.71/3,915.50
6. Step 6: Final answer
   x = 3,118.11