Finding the Third Proportional to 21,363.12 and 39,855.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,363.12 : 39,855.80 = 39,855.80 : x
2. Step 2: Convert to fraction form
   21,363.12/39,855.80 = 39,855.80/x
3. Step 3: Cross multiply
   21,363.12x = 39,855.80 × 39,855.80
4. Step 4: Simplify right side
   21,363.12x = 1,588,484,544.54
5. Step 5: Solve for x
   x = 1,588,484,544.54/21,363.12
6. Step 6: Final answer
   x = 74,356.40