Finding the Third Proportional to 82,200 and 123,900

Step by Step Solution

1. Step 1: Write the proportion equation
   82,200 : 123,900 = 123,900 : x
2. Step 2: Convert to fraction form
   82,200/123,900 = 123,900/x
3. Step 3: Cross multiply
   82,200x = 123,900 × 123,900
4. Step 4: Simplify right side
   82,200x = 15,351,210,000
5. Step 5: Solve for x
   x = 15,351,210,000/82,200
6. Step 6: Final answer
   x = 186,754.38