Finding the Third Proportional to 72,720 and 153,216

Step by Step Solution

1. Step 1: Write the proportion equation
   72,720 : 153,216 = 153,216 : x
2. Step 2: Convert to fraction form
   72,720/153,216 = 153,216/x
3. Step 3: Cross multiply
   72,720x = 153,216 × 153,216
4. Step 4: Simplify right side
   72,720x = 23,475,142,656
5. Step 5: Solve for x
   x = 23,475,142,656/72,720
6. Step 6: Final answer
   x = 322,815.49