Finding the Third Proportional to 420,463.50 and 660,828

Step by Step Solution

1. Step 1: Write the proportion equation
   420,463.50 : 660,828 = 660,828 : x
2. Step 2: Convert to fraction form
   420,463.50/660,828 = 660,828/x
3. Step 3: Cross multiply
   420,463.50x = 660,828 × 660,828
4. Step 4: Simplify right side
   420,463.50x = 436,693,645,584
5. Step 5: Solve for x
   x = 436,693,645,584/420,463.50
6. Step 6: Final answer
   x = 1,038,600.61