Finding the Third Proportional to 128,757.50 and 173,263.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,757.50 : 173,263.50 = 173,263.50 : x
2. Step 2: Convert to fraction form
   128,757.50/173,263.50 = 173,263.50/x
3. Step 3: Cross multiply
   128,757.50x = 173,263.50 × 173,263.50
4. Step 4: Simplify right side
   128,757.50x = 30,020,240,432.25
5. Step 5: Solve for x
   x = 30,020,240,432.25/128,757.50
6. Step 6: Final answer
   x = 233,153.33