Finding the Third Proportional to 412,888 and 638,116.50

Step by Step Solution

1. Step 1: Write the proportion equation
   412,888 : 638,116.50 = 638,116.50 : x
2. Step 2: Convert to fraction form
   412,888/638,116.50 = 638,116.50/x
3. Step 3: Cross multiply
   412,888x = 638,116.50 × 638,116.50
4. Step 4: Simplify right side
   412,888x = 407,192,667,572.25
5. Step 5: Solve for x
   x = 407,192,667,572.25/412,888
6. Step 6: Final answer
   x = 986,206.11