Finding the Third Proportional to 111,289.50 and 240,399

Step by Step Solution

1. Step 1: Write the proportion equation
   111,289.50 : 240,399 = 240,399 : x
2. Step 2: Convert to fraction form
   111,289.50/240,399 = 240,399/x
3. Step 3: Cross multiply
   111,289.50x = 240,399 × 240,399
4. Step 4: Simplify right side
   111,289.50x = 57,791,679,201
5. Step 5: Solve for x
   x = 57,791,679,201/111,289.50
6. Step 6: Final answer
   x = 519,291.39