Finding the Fourth Proportional to 10,915.92, 16,374.30 and 3,520.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,915.92 : 16,374.30 = 3,520.50 : x
2. Step 2: Convert to fraction form
   10,915.92/16,374.30 = 3,520.50/x
3. Step 3: Cross multiply
   10,915.92x = 16,374.30 × 3,520.50
4. Step 4: Simplify right side
   10,915.92x = 57,645,723.15
5. Step 5: Solve for x
   x = 57,645,723.15/10,915.92
6. Step 6: Final answer
   x = 5,280.89