Finding the Third Proportional to 282,639 and 396,112.50

Step by Step Solution

1. Step 1: Write the proportion equation
   282,639 : 396,112.50 = 396,112.50 : x
2. Step 2: Convert to fraction form
   282,639/396,112.50 = 396,112.50/x
3. Step 3: Cross multiply
   282,639x = 396,112.50 × 396,112.50
4. Step 4: Simplify right side
   282,639x = 156,905,112,656.25
5. Step 5: Solve for x
   x = 156,905,112,656.25/282,639
6. Step 6: Final answer
   x = 555,143.18