Finding the Third Proportional to 420,408 and 652,763.81

Step by Step Solution

1. Step 1: Write the proportion equation
   420,408 : 652,763.81 = 652,763.81 : x
2. Step 2: Convert to fraction form
   420,408/652,763.81 = 652,763.81/x
3. Step 3: Cross multiply
   420,408x = 652,763.81 × 652,763.81
4. Step 4: Simplify right side
   420,408x = 426,100,594,909.54
5. Step 5: Solve for x
   x = 426,100,594,909.54/420,408
6. Step 6: Final answer
   x = 1,013,540.64