Finding the Third Proportional to 111,681 and 243,440

Step by Step Solution

1. Step 1: Write the proportion equation
   111,681 : 243,440 = 243,440 : x
2. Step 2: Convert to fraction form
   111,681/243,440 = 243,440/x
3. Step 3: Cross multiply
   111,681x = 243,440 × 243,440
4. Step 4: Simplify right side
   111,681x = 59,263,033,600
5. Step 5: Solve for x
   x = 59,263,033,600/111,681
6. Step 6: Final answer
   x = 530,645.62