Finding the Third Proportional to 129,408 and 173,911.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,408 : 173,911.50 = 173,911.50 : x
2. Step 2: Convert to fraction form
   129,408/173,911.50 = 173,911.50/x
3. Step 3: Cross multiply
   129,408x = 173,911.50 × 173,911.50
4. Step 4: Simplify right side
   129,408x = 30,245,209,832.25
5. Step 5: Solve for x
   x = 30,245,209,832.25/129,408
6. Step 6: Final answer
   x = 233,719.78