Finding the Third Proportional to 405,819 and 630,832.50

Step by Step Solution

1. Step 1: Write the proportion equation
   405,819 : 630,832.50 = 630,832.50 : x
2. Step 2: Convert to fraction form
   405,819/630,832.50 = 630,832.50/x
3. Step 3: Cross multiply
   405,819x = 630,832.50 × 630,832.50
4. Step 4: Simplify right side
   405,819x = 397,949,643,056.25
5. Step 5: Solve for x
   x = 397,949,643,056.25/405,819
6. Step 6: Final answer
   x = 980,608.70