Finding the Third Proportional to 215,416 and 301,866.50

Step by Step Solution

1. Step 1: Write the proportion equation
   215,416 : 301,866.50 = 301,866.50 : x
2. Step 2: Convert to fraction form
   215,416/301,866.50 = 301,866.50/x
3. Step 3: Cross multiply
   215,416x = 301,866.50 × 301,866.50
4. Step 4: Simplify right side
   215,416x = 91,123,383,822.25
5. Step 5: Solve for x
   x = 91,123,383,822.25/215,416
6. Step 6: Final answer
   x = 423,011.21