Finding the Third Proportional to 214,979.50 and 300,680

Step by Step Solution

1. Step 1: Write the proportion equation
   214,979.50 : 300,680 = 300,680 : x
2. Step 2: Convert to fraction form
   214,979.50/300,680 = 300,680/x
3. Step 3: Cross multiply
   214,979.50x = 300,680 × 300,680
4. Step 4: Simplify right side
   214,979.50x = 90,408,462,400
5. Step 5: Solve for x
   x = 90,408,462,400/214,979.50
6. Step 6: Final answer
   x = 420,544.57