Finding the Third Proportional to 111,931.50 and 155,137.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,931.50 : 155,137.50 = 155,137.50 : x
2. Step 2: Convert to fraction form
   111,931.50/155,137.50 = 155,137.50/x
3. Step 3: Cross multiply
   111,931.50x = 155,137.50 × 155,137.50
4. Step 4: Simplify right side
   111,931.50x = 24,067,643,906.25
5. Step 5: Solve for x
   x = 24,067,643,906.25/111,931.50
6. Step 6: Final answer
   x = 215,021.19