Finding the Third Proportional to 272,436 and 425,212.50

Step by Step Solution

1. Step 1: Write the proportion equation
   272,436 : 425,212.50 = 425,212.50 : x
2. Step 2: Convert to fraction form
   272,436/425,212.50 = 425,212.50/x
3. Step 3: Cross multiply
   272,436x = 425,212.50 × 425,212.50
4. Step 4: Simplify right side
   272,436x = 180,805,670,156.25
5. Step 5: Solve for x
   x = 180,805,670,156.25/272,436
6. Step 6: Final answer
   x = 663,662.92