Finding the Third Proportional to 200,921 and 429,805

Step by Step Solution

1. Step 1: Write the proportion equation
   200,921 : 429,805 = 429,805 : x
2. Step 2: Convert to fraction form
   200,921/429,805 = 429,805/x
3. Step 3: Cross multiply
   200,921x = 429,805 × 429,805
4. Step 4: Simplify right side
   200,921x = 184,732,338,025
5. Step 5: Solve for x
   x = 184,732,338,025/200,921
6. Step 6: Final answer
   x = 919,427.73