Finding the Third Proportional to 87,109.50 and 122,671.50

Step by Step Solution

1. Step 1: Write the proportion equation
   87,109.50 : 122,671.50 = 122,671.50 : x
2. Step 2: Convert to fraction form
   87,109.50/122,671.50 = 122,671.50/x
3. Step 3: Cross multiply
   87,109.50x = 122,671.50 × 122,671.50
4. Step 4: Simplify right side
   87,109.50x = 15,048,296,912.25
5. Step 5: Solve for x
   x = 15,048,296,912.25/87,109.50
6. Step 6: Final answer
   x = 172,751.50