Finding the Third Proportional to 213,903 and 308,299.50

Step by Step Solution

1. Step 1: Write the proportion equation
   213,903 : 308,299.50 = 308,299.50 : x
2. Step 2: Convert to fraction form
   213,903/308,299.50 = 308,299.50/x
3. Step 3: Cross multiply
   213,903x = 308,299.50 × 308,299.50
4. Step 4: Simplify right side
   213,903x = 95,048,581,700.25
5. Step 5: Solve for x
   x = 95,048,581,700.25/213,903
6. Step 6: Final answer
   x = 444,353.66