Finding the Third Proportional to 420,660 and 912,295.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,660 : 912,295.50 = 912,295.50 : x
2. Step 2: Convert to fraction form
   420,660/912,295.50 = 912,295.50/x
3. Step 3: Cross multiply
   420,660x = 912,295.50 × 912,295.50
4. Step 4: Simplify right side
   420,660x = 832,283,079,320.25
5. Step 5: Solve for x
   x = 832,283,079,320.25/420,660
6. Step 6: Final answer
   x = 1,978,517.28