Finding the Third Proportional to 111,901.50 and 218,133

Step by Step Solution

1. Step 1: Write the proportion equation
   111,901.50 : 218,133 = 218,133 : x
2. Step 2: Convert to fraction form
   111,901.50/218,133 = 218,133/x
3. Step 3: Cross multiply
   111,901.50x = 218,133 × 218,133
4. Step 4: Simplify right side
   111,901.50x = 47,582,005,689
5. Step 5: Solve for x
   x = 47,582,005,689/111,901.50
6. Step 6: Final answer
   x = 425,213.30