Finding the Third Proportional to 189,910.50 and 300,721.50

Step by Step Solution

1. Step 1: Write the proportion equation
   189,910.50 : 300,721.50 = 300,721.50 : x
2. Step 2: Convert to fraction form
   189,910.50/300,721.50 = 300,721.50/x
3. Step 3: Cross multiply
   189,910.50x = 300,721.50 × 300,721.50
4. Step 4: Simplify right side
   189,910.50x = 90,433,420,562.25
5. Step 5: Solve for x
   x = 90,433,420,562.25/189,910.50
6. Step 6: Final answer
   x = 476,189.68