Finding the Third Proportional to 111,866 and 218,060

Step by Step Solution

1. Step 1: Write the proportion equation
   111,866 : 218,060 = 218,060 : x
2. Step 2: Convert to fraction form
   111,866/218,060 = 218,060/x
3. Step 3: Cross multiply
   111,866x = 218,060 × 218,060
4. Step 4: Simplify right side
   111,866x = 47,550,163,600
5. Step 5: Solve for x
   x = 47,550,163,600/111,866
6. Step 6: Final answer
   x = 425,063.59