Finding the Third Proportional to 287,766 and 426,066

Step by Step Solution

1. Step 1: Write the proportion equation
   287,766 : 426,066 = 426,066 : x
2. Step 2: Convert to fraction form
   287,766/426,066 = 426,066/x
3. Step 3: Cross multiply
   287,766x = 426,066 × 426,066
4. Step 4: Simplify right side
   287,766x = 181,532,236,356
5. Step 5: Solve for x
   x = 181,532,236,356/287,766
6. Step 6: Final answer
   x = 630,832.82