Finding the Fourth Proportional to 16,878.72, 25,290.72 and 10,284.90

Step by Step Solution

1. Step 1: Write the proportion equation
   16,878.72 : 25,290.72 = 10,284.90 : x
2. Step 2: Convert to fraction form
   16,878.72/25,290.72 = 10,284.90/x
3. Step 3: Cross multiply
   16,878.72x = 25,290.72 × 10,284.90
4. Step 4: Simplify right side
   16,878.72x = 260,112,526.13
5. Step 5: Solve for x
   x = 260,112,526.13/16,878.72
6. Step 6: Final answer
   x = 15,410.68