Finding the Third Proportional to 128,749.50 and 188,515.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,749.50 : 188,515.50 = 188,515.50 : x
2. Step 2: Convert to fraction form
   128,749.50/188,515.50 = 188,515.50/x
3. Step 3: Cross multiply
   128,749.50x = 188,515.50 × 188,515.50
4. Step 4: Simplify right side
   128,749.50x = 35,538,093,740.25
5. Step 5: Solve for x
   x = 35,538,093,740.25/128,749.50
6. Step 6: Final answer
   x = 276,025.10