Finding the Third Proportional to 172,128 and 375,408

Step by Step Solution

1. Step 1: Write the proportion equation
   172,128 : 375,408 = 375,408 : x
2. Step 2: Convert to fraction form
   172,128/375,408 = 375,408/x
3. Step 3: Cross multiply
   172,128x = 375,408 × 375,408
4. Step 4: Simplify right side
   172,128x = 140,931,166,464
5. Step 5: Solve for x
   x = 140,931,166,464/172,128
6. Step 6: Final answer
   x = 818,757.94