Finding the Third Proportional to 300,885 and 648,790.50

Step by Step Solution

1. Step 1: Write the proportion equation
   300,885 : 648,790.50 = 648,790.50 : x
2. Step 2: Convert to fraction form
   300,885/648,790.50 = 648,790.50/x
3. Step 3: Cross multiply
   300,885x = 648,790.50 × 648,790.50
4. Step 4: Simplify right side
   300,885x = 420,929,112,890.25
5. Step 5: Solve for x
   x = 420,929,112,890.25/300,885
6. Step 6: Final answer
   x = 1,398,970.08