Finding the Third Proportional to 128,499.75 and 188,365.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,499.75 : 188,365.50 = 188,365.50 : x
2. Step 2: Convert to fraction form
   128,499.75/188,365.50 = 188,365.50/x
3. Step 3: Cross multiply
   128,499.75x = 188,365.50 × 188,365.50
4. Step 4: Simplify right side
   128,499.75x = 35,481,561,590.25
5. Step 5: Solve for x
   x = 35,481,561,590.25/128,499.75
6. Step 6: Final answer
   x = 276,121.64