Finding the Third Proportional to 420,318 and 899,680.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,318 : 899,680.50 = 899,680.50 : x
2. Step 2: Convert to fraction form
   420,318/899,680.50 = 899,680.50/x
3. Step 3: Cross multiply
   420,318x = 899,680.50 × 899,680.50
4. Step 4: Simplify right side
   420,318x = 809,425,002,080.25
5. Step 5: Solve for x
   x = 809,425,002,080.25/420,318
6. Step 6: Final answer
   x = 1,925,744.32