Finding the Third Proportional to 218,397 and 447,379.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,397 : 447,379.50 = 447,379.50 : x
2. Step 2: Convert to fraction form
   218,397/447,379.50 = 447,379.50/x
3. Step 3: Cross multiply
   218,397x = 447,379.50 × 447,379.50
4. Step 4: Simplify right side
   218,397x = 200,148,417,020.25
5. Step 5: Solve for x
   x = 200,148,417,020.25/218,397
6. Step 6: Final answer
   x = 916,443.07