Finding the Third Proportional to 171,642 and 358,978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   171,642 : 358,978.50 = 358,978.50 : x
2. Step 2: Convert to fraction form
   171,642/358,978.50 = 358,978.50/x
3. Step 3: Cross multiply
   171,642x = 358,978.50 × 358,978.50
4. Step 4: Simplify right side
   171,642x = 128,865,563,462.25
5. Step 5: Solve for x
   x = 128,865,563,462.25/171,642
6. Step 6: Final answer
   x = 750,781.06