Finding the Third Proportional to 111,921 and 243,520.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,921 : 243,520.50 = 243,520.50 : x
2. Step 2: Convert to fraction form
   111,921/243,520.50 = 243,520.50/x
3. Step 3: Cross multiply
   111,921x = 243,520.50 × 243,520.50
4. Step 4: Simplify right side
   111,921x = 59,302,233,920.25
5. Step 5: Solve for x
   x = 59,302,233,920.25/111,921
6. Step 6: Final answer
   x = 529,857.97