Finding the Third Proportional to 12,803 and 20,039.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,803 : 20,039.50 = 20,039.50 : x
2. Step 2: Convert to fraction form
   12,803/20,039.50 = 20,039.50/x
3. Step 3: Cross multiply
   12,803x = 20,039.50 × 20,039.50
4. Step 4: Simplify right side
   12,803x = 401,581,560.25
5. Step 5: Solve for x
   x = 401,581,560.25/12,803
6. Step 6: Final answer
   x = 31,366.21