Finding the Third Proportional to 420,231 and 630,776.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,231 : 630,776.50 = 630,776.50 : x
2. Step 2: Convert to fraction form
   420,231/630,776.50 = 630,776.50/x
3. Step 3: Cross multiply
   420,231x = 630,776.50 × 630,776.50
4. Step 4: Simplify right side
   420,231x = 397,878,992,952.25
5. Step 5: Solve for x
   x = 397,878,992,952.25/420,231
6. Step 6: Final answer
   x = 946,810.19