Finding the Third Proportional to 215,028 and 300,751.50

Step by Step Solution

1. Step 1: Write the proportion equation
   215,028 : 300,751.50 = 300,751.50 : x
2. Step 2: Convert to fraction form
   215,028/300,751.50 = 300,751.50/x
3. Step 3: Cross multiply
   215,028x = 300,751.50 × 300,751.50
4. Step 4: Simplify right side
   215,028x = 90,451,464,752.25
5. Step 5: Solve for x
   x = 90,451,464,752.25/215,028
6. Step 6: Final answer
   x = 420,649.70