Finding the Third Proportional to 111,870 and 218,070

Step by Step Solution

1. Step 1: Write the proportion equation
   111,870 : 218,070 = 218,070 : x
2. Step 2: Convert to fraction form
   111,870/218,070 = 218,070/x
3. Step 3: Cross multiply
   111,870x = 218,070 × 218,070
4. Step 4: Simplify right side
   111,870x = 47,554,524,900
5. Step 5: Solve for x
   x = 47,554,524,900/111,870
6. Step 6: Final answer
   x = 425,087.38