Finding the Third Proportional to 171,642 and 358,978

Step by Step Solution

1. Step 1: Write the proportion equation
   171,642 : 358,978 = 358,978 : x
2. Step 2: Convert to fraction form
   171,642/358,978 = 358,978/x
3. Step 3: Cross multiply
   171,642x = 358,978 × 358,978
4. Step 4: Simplify right side
   171,642x = 128,865,204,484
5. Step 5: Solve for x
   x = 128,865,204,484/171,642
6. Step 6: Final answer
   x = 750,778.97