Finding the Third Proportional to 111,611.50 and 263,425

Step by Step Solution

1. Step 1: Write the proportion equation
   111,611.50 : 263,425 = 263,425 : x
2. Step 2: Convert to fraction form
   111,611.50/263,425 = 263,425/x
3. Step 3: Cross multiply
   111,611.50x = 263,425 × 263,425
4. Step 4: Simplify right side
   111,611.50x = 69,392,730,625
5. Step 5: Solve for x
   x = 69,392,730,625/111,611.50
6. Step 6: Final answer
   x = 621,734.59