Finding the Third Proportional to 129,716 and 200,300

Step by Step Solution

1. Step 1: Write the proportion equation
   129,716 : 200,300 = 200,300 : x
2. Step 2: Convert to fraction form
   129,716/200,300 = 200,300/x
3. Step 3: Cross multiply
   129,716x = 200,300 × 200,300
4. Step 4: Simplify right side
   129,716x = 40,120,090,000
5. Step 5: Solve for x
   x = 40,120,090,000/129,716
6. Step 6: Final answer
   x = 309,291.76