Finding the Third Proportional to 172,908 and 253,128

Step by Step Solution

1. Step 1: Write the proportion equation
   172,908 : 253,128 = 253,128 : x
2. Step 2: Convert to fraction form
   172,908/253,128 = 253,128/x
3. Step 3: Cross multiply
   172,908x = 253,128 × 253,128
4. Step 4: Simplify right side
   172,908x = 64,073,784,384
5. Step 5: Solve for x
   x = 64,073,784,384/172,908
6. Step 6: Final answer
   x = 370,565.76