Finding the Third Proportional to 111,717.56 and 263,499.75

Step by Step Solution

1. Step 1: Write the proportion equation
   111,717.56 : 263,499.75 = 263,499.75 : x
2. Step 2: Convert to fraction form
   111,717.56/263,499.75 = 263,499.75/x
3. Step 3: Cross multiply
   111,717.56x = 263,499.75 × 263,499.75
4. Step 4: Simplify right side
   111,717.56x = 69,432,118,250.06
5. Step 5: Solve for x
   x = 69,432,118,250.06/111,717.56
6. Step 6: Final answer
   x = 621,496.90