Finding the Fourth Proportional to 28,608.50, 42,919.24 and 10,140.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,608.50 : 42,919.24 = 10,140.50 : x
2. Step 2: Convert to fraction form
   28,608.50/42,919.24 = 10,140.50/x
3. Step 3: Cross multiply
   28,608.50x = 42,919.24 × 10,140.50
4. Step 4: Simplify right side
   28,608.50x = 435,222,553.22
5. Step 5: Solve for x
   x = 435,222,553.22/28,608.50
6. Step 6: Final answer
   x = 15,213.05