Finding the Third Proportional to 212,634 and 440,212.50

Step by Step Solution

1. Step 1: Write the proportion equation
   212,634 : 440,212.50 = 440,212.50 : x
2. Step 2: Convert to fraction form
   212,634/440,212.50 = 440,212.50/x
3. Step 3: Cross multiply
   212,634x = 440,212.50 × 440,212.50
4. Step 4: Simplify right side
   212,634x = 193,787,045,156.25
5. Step 5: Solve for x
   x = 193,787,045,156.25/212,634
6. Step 6: Final answer
   x = 911,364.34