Finding the Fourth Proportional to 10,115.50, 15,175.81 and 2,819.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,115.50 : 15,175.81 = 2,819.50 : x
2. Step 2: Convert to fraction form
   10,115.50/15,175.81 = 2,819.50/x
3. Step 3: Cross multiply
   10,115.50x = 15,175.81 × 2,819.50
4. Step 4: Simplify right side
   10,115.50x = 42,788,196.30
5. Step 5: Solve for x
   x = 42,788,196.30/10,115.50
6. Step 6: Final answer
   x = 4,229.96