Finding the Third Proportional to 72,128 and 153,472

Step by Step Solution

1. Step 1: Write the proportion equation
   72,128 : 153,472 = 153,472 : x
2. Step 2: Convert to fraction form
   72,128/153,472 = 153,472/x
3. Step 3: Cross multiply
   72,128x = 153,472 × 153,472
4. Step 4: Simplify right side
   72,128x = 23,553,654,784
5. Step 5: Solve for x
   x = 23,553,654,784/72,128
6. Step 6: Final answer
   x = 326,553.55