Finding the Third Proportional to 72,151.50 and 128,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,151.50 : 128,719.50 = 128,719.50 : x
2. Step 2: Convert to fraction form
   72,151.50/128,719.50 = 128,719.50/x
3. Step 3: Cross multiply
   72,151.50x = 128,719.50 × 128,719.50
4. Step 4: Simplify right side
   72,151.50x = 16,568,709,680.25
5. Step 5: Solve for x
   x = 16,568,709,680.25/72,151.50
6. Step 6: Final answer
   x = 229,637.77