Finding the Fourth Proportional to 28,513.62, 42,769.62 and 10,987.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,513.62 : 42,769.62 = 10,987.25 : x
2. Step 2: Convert to fraction form
   28,513.62/42,769.62 = 10,987.25/x
3. Step 3: Cross multiply
   28,513.62x = 42,769.62 × 10,987.25
4. Step 4: Simplify right side
   28,513.62x = 469,920,293.50
5. Step 5: Solve for x
   x = 469,920,293.50/28,513.62
6. Step 6: Final answer
   x = 16,480.56