Finding the Third Proportional to 39,898.50 and 81,619.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,898.50 : 81,619.50 = 81,619.50 : x
2. Step 2: Convert to fraction form
   39,898.50/81,619.50 = 81,619.50/x
3. Step 3: Cross multiply
   39,898.50x = 81,619.50 × 81,619.50
4. Step 4: Simplify right side
   39,898.50x = 6,661,742,780.25
5. Step 5: Solve for x
   x = 6,661,742,780.25/39,898.50
6. Step 6: Final answer
   x = 166,967.25