Finding the Third Proportional to 40,109 and 87,145

Step by Step Solution

1. Step 1: Write the proportion equation
   40,109 : 87,145 = 87,145 : x
2. Step 2: Convert to fraction form
   40,109/87,145 = 87,145/x
3. Step 3: Cross multiply
   40,109x = 87,145 × 87,145
4. Step 4: Simplify right side
   40,109x = 7,594,251,025
5. Step 5: Solve for x
   x = 7,594,251,025/40,109
6. Step 6: Final answer
   x = 189,340.32