Finding the Third Proportional to 411,991.50 and 636,654

Step by Step Solution

1. Step 1: Write the proportion equation
   411,991.50 : 636,654 = 636,654 : x
2. Step 2: Convert to fraction form
   411,991.50/636,654 = 636,654/x
3. Step 3: Cross multiply
   411,991.50x = 636,654 × 636,654
4. Step 4: Simplify right side
   411,991.50x = 405,328,315,716
5. Step 5: Solve for x
   x = 405,328,315,716/411,991.50
6. Step 6: Final answer
   x = 983,826.89