Finding the Third Proportional to 212,987 and 454,390.50

Step by Step Solution

1. Step 1: Write the proportion equation
   212,987 : 454,390.50 = 454,390.50 : x
2. Step 2: Convert to fraction form
   212,987/454,390.50 = 454,390.50/x
3. Step 3: Cross multiply
   212,987x = 454,390.50 × 454,390.50
4. Step 4: Simplify right side
   212,987x = 206,470,726,490.25
5. Step 5: Solve for x
   x = 206,470,726,490.25/212,987
6. Step 6: Final answer
   x = 969,405.30