Finding the Third Proportional to 111,671 and 243,421

Step by Step Solution

1. Step 1: Write the proportion equation
   111,671 : 243,421 = 243,421 : x
2. Step 2: Convert to fraction form
   111,671/243,421 = 243,421/x
3. Step 3: Cross multiply
   111,671x = 243,421 × 243,421
4. Step 4: Simplify right side
   111,671x = 59,253,783,241
5. Step 5: Solve for x
   x = 59,253,783,241/111,671
6. Step 6: Final answer
   x = 530,610.30