Finding the Third Proportional to 238,139.50 and 323,420

Step by Step Solution

1. Step 1: Write the proportion equation
   238,139.50 : 323,420 = 323,420 : x
2. Step 2: Convert to fraction form
   238,139.50/323,420 = 323,420/x
3. Step 3: Cross multiply
   238,139.50x = 323,420 × 323,420
4. Step 4: Simplify right side
   238,139.50x = 104,600,496,400
5. Step 5: Solve for x
   x = 104,600,496,400/238,139.50
6. Step 6: Final answer
   x = 439,240.43