Finding the Third Proportional to 111,689 and 243,459.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,689 : 243,459.50 = 243,459.50 : x
2. Step 2: Convert to fraction form
   111,689/243,459.50 = 243,459.50/x
3. Step 3: Cross multiply
   111,689x = 243,459.50 × 243,459.50
4. Step 4: Simplify right side
   111,689x = 59,272,528,140.25
5. Step 5: Solve for x
   x = 59,272,528,140.25/111,689
6. Step 6: Final answer
   x = 530,692.62