Finding the Third Proportional to 111,715.50 and 239,422.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,715.50 : 239,422.50 = 239,422.50 : x
2. Step 2: Convert to fraction form
   111,715.50/239,422.50 = 239,422.50/x
3. Step 3: Cross multiply
   111,715.50x = 239,422.50 × 239,422.50
4. Step 4: Simplify right side
   111,715.50x = 57,323,133,506.25
5. Step 5: Solve for x
   x = 57,323,133,506.25/111,715.50
6. Step 6: Final answer
   x = 513,117.10