Finding the Third Proportional to 420,336 and 664,537.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,336 : 664,537.50 = 664,537.50 : x
2. Step 2: Convert to fraction form
   420,336/664,537.50 = 664,537.50/x
3. Step 3: Cross multiply
   420,336x = 664,537.50 × 664,537.50
4. Step 4: Simplify right side
   420,336x = 441,610,088,906.25
5. Step 5: Solve for x
   x = 441,610,088,906.25/420,336
6. Step 6: Final answer
   x = 1,050,612.10