Finding the Third Proportional to 339.50 and 432.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339.50 : 432.50 = 432.50 : x
2. Step 2: Convert to fraction form
   339.50/432.50 = 432.50/x
3. Step 3: Cross multiply
   339.50x = 432.50 × 432.50
4. Step 4: Simplify right side
   339.50x = 187,056.25
5. Step 5: Solve for x
   x = 187,056.25/339.50
6. Step 6: Final answer
   x = 550.98