Finding the Third Proportional to 88,137.50 and 128,514.50

Step by Step Solution

1. Step 1: Write the proportion equation
   88,137.50 : 128,514.50 = 128,514.50 : x
2. Step 2: Convert to fraction form
   88,137.50/128,514.50 = 128,514.50/x
3. Step 3: Cross multiply
   88,137.50x = 128,514.50 × 128,514.50
4. Step 4: Simplify right side
   88,137.50x = 16,515,976,710.25
5. Step 5: Solve for x
   x = 16,515,976,710.25/88,137.50
6. Step 6: Final answer
   x = 187,388.76