Finding the Third Proportional to 111,708 and 243,112.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,708 : 243,112.50 = 243,112.50 : x
2. Step 2: Convert to fraction form
   111,708/243,112.50 = 243,112.50/x
3. Step 3: Cross multiply
   111,708x = 243,112.50 × 243,112.50
4. Step 4: Simplify right side
   111,708x = 59,103,687,656.25
5. Step 5: Solve for x
   x = 59,103,687,656.25/111,708
6. Step 6: Final answer
   x = 529,090.91