Finding the Third Proportional to 434,510 and 636,210

Step by Step Solution

1. Step 1: Write the proportion equation
   434,510 : 636,210 = 636,210 : x
2. Step 2: Convert to fraction form
   434,510/636,210 = 636,210/x
3. Step 3: Cross multiply
   434,510x = 636,210 × 636,210
4. Step 4: Simplify right side
   434,510x = 404,763,164,100
5. Step 5: Solve for x
   x = 404,763,164,100/434,510
6. Step 6: Final answer
   x = 931,539.35