Finding the Third Proportional to 19,728 and 28,858.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,728 : 28,858.50 = 28,858.50 : x
2. Step 2: Convert to fraction form
   19,728/28,858.50 = 28,858.50/x
3. Step 3: Cross multiply
   19,728x = 28,858.50 × 28,858.50
4. Step 4: Simplify right side
   19,728x = 832,813,022.25
5. Step 5: Solve for x
   x = 832,813,022.25/19,728
6. Step 6: Final answer
   x = 42,214.77