Finding the Third Proportional to 111,989 and 243,658

Step by Step Solution

1. Step 1: Write the proportion equation
   111,989 : 243,658 = 243,658 : x
2. Step 2: Convert to fraction form
   111,989/243,658 = 243,658/x
3. Step 3: Cross multiply
   111,989x = 243,658 × 243,658
4. Step 4: Simplify right side
   111,989x = 59,369,220,964
5. Step 5: Solve for x
   x = 59,369,220,964/111,989
6. Step 6: Final answer
   x = 530,134.40