Finding the Third Proportional to 412,862.50 and 638,081.50

Step by Step Solution

1. Step 1: Write the proportion equation
   412,862.50 : 638,081.50 = 638,081.50 : x
2. Step 2: Convert to fraction form
   412,862.50/638,081.50 = 638,081.50/x
3. Step 3: Cross multiply
   412,862.50x = 638,081.50 × 638,081.50
4. Step 4: Simplify right side
   412,862.50x = 407,148,000,642.25
5. Step 5: Solve for x
   x = 407,148,000,642.25/412,862.50
6. Step 6: Final answer
   x = 986,158.83