Finding the Third Proportional to 128,809.50 and 173,530.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,809.50 : 173,530.50 = 173,530.50 : x
2. Step 2: Convert to fraction form
   128,809.50/173,530.50 = 173,530.50/x
3. Step 3: Cross multiply
   128,809.50x = 173,530.50 × 173,530.50
4. Step 4: Simplify right side
   128,809.50x = 30,112,834,430.25
5. Step 5: Solve for x
   x = 30,112,834,430.25/128,809.50
6. Step 6: Final answer
   x = 233,778.06