Finding the Third Proportional to 40,008 and 87,172

Step by Step Solution

1. Step 1: Write the proportion equation
   40,008 : 87,172 = 87,172 : x
2. Step 2: Convert to fraction form
   40,008/87,172 = 87,172/x
3. Step 3: Cross multiply
   40,008x = 87,172 × 87,172
4. Step 4: Simplify right side
   40,008x = 7,598,957,584
5. Step 5: Solve for x
   x = 7,598,957,584/40,008
6. Step 6: Final answer
   x = 189,935.95