Finding the Third Proportional to 420,727.50 and 912,789

Step by Step Solution

1. Step 1: Write the proportion equation
   420,727.50 : 912,789 = 912,789 : x
2. Step 2: Convert to fraction form
   420,727.50/912,789 = 912,789/x
3. Step 3: Cross multiply
   420,727.50x = 912,789 × 912,789
4. Step 4: Simplify right side
   420,727.50x = 833,183,758,521
5. Step 5: Solve for x
   x = 833,183,758,521/420,727.50
6. Step 6: Final answer
   x = 1,980,340.62