Finding the Third Proportional to 111,816 and 243,318

Step by Step Solution

1. Step 1: Write the proportion equation
   111,816 : 243,318 = 243,318 : x
2. Step 2: Convert to fraction form
   111,816/243,318 = 243,318/x
3. Step 3: Cross multiply
   111,816x = 243,318 × 243,318
4. Step 4: Simplify right side
   111,816x = 59,203,649,124
5. Step 5: Solve for x
   x = 59,203,649,124/111,816
6. Step 6: Final answer
   x = 529,473.86