Finding the Third Proportional to 72,003 and 168,215

Step by Step Solution

1. Step 1: Write the proportion equation
   72,003 : 168,215 = 168,215 : x
2. Step 2: Convert to fraction form
   72,003/168,215 = 168,215/x
3. Step 3: Cross multiply
   72,003x = 168,215 × 168,215
4. Step 4: Simplify right side
   72,003x = 28,296,286,225
5. Step 5: Solve for x
   x = 28,296,286,225/72,003
6. Step 6: Final answer
   x = 392,987.60