Finding the Third Proportional to 138,775.50 and 288,459

Step by Step Solution

1. Step 1: Write the proportion equation
   138,775.50 : 288,459 = 288,459 : x
2. Step 2: Convert to fraction form
   138,775.50/288,459 = 288,459/x
3. Step 3: Cross multiply
   138,775.50x = 288,459 × 288,459
4. Step 4: Simplify right side
   138,775.50x = 83,208,594,681
5. Step 5: Solve for x
   x = 83,208,594,681/138,775.50
6. Step 6: Final answer
   x = 599,591.39