Finding the Third Proportional to 138,987 and 303,459.75

Step by Step Solution

1. Step 1: Write the proportion equation
   138,987 : 303,459.75 = 303,459.75 : x
2. Step 2: Convert to fraction form
   138,987/303,459.75 = 303,459.75/x
3. Step 3: Cross multiply
   138,987x = 303,459.75 × 303,459.75
4. Step 4: Simplify right side
   138,987x = 92,087,819,870.06
5. Step 5: Solve for x
   x = 92,087,819,870.06/138,987
6. Step 6: Final answer
   x = 662,564.27