Finding the Third Proportional to 420,288.75 and 912,019.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,288.75 : 912,019.50 = 912,019.50 : x
2. Step 2: Convert to fraction form
   420,288.75/912,019.50 = 912,019.50/x
3. Step 3: Cross multiply
   420,288.75x = 912,019.50 × 912,019.50
4. Step 4: Simplify right side
   420,288.75x = 831,779,568,380.25
5. Step 5: Solve for x
   x = 831,779,568,380.25/420,288.75
6. Step 6: Final answer
   x = 1,979,066.94