Finding the Third Proportional to 21,724.50 and 30,318.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,724.50 : 30,318.75 = 30,318.75 : x
2. Step 2: Convert to fraction form
   21,724.50/30,318.75 = 30,318.75/x
3. Step 3: Cross multiply
   21,724.50x = 30,318.75 × 30,318.75
4. Step 4: Simplify right side
   21,724.50x = 919,226,601.56
5. Step 5: Solve for x
   x = 919,226,601.56/21,724.50
6. Step 6: Final answer
   x = 42,312.90