Finding the Third Proportional to 12,928.50 and 16,899.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,928.50 : 16,899.75 = 16,899.75 : x
2. Step 2: Convert to fraction form
   12,928.50/16,899.75 = 16,899.75/x
3. Step 3: Cross multiply
   12,928.50x = 16,899.75 × 16,899.75
4. Step 4: Simplify right side
   12,928.50x = 285,601,550.06
5. Step 5: Solve for x
   x = 285,601,550.06/12,928.50
6. Step 6: Final answer
   x = 22,090.85