Finding the Third Proportional to 83,087.16 and 128,898.56

Step by Step Solution

1. Step 1: Write the proportion equation
   83,087.16 : 128,898.56 = 128,898.56 : x
2. Step 2: Convert to fraction form
   83,087.16/128,898.56 = 128,898.56/x
3. Step 3: Cross multiply
   83,087.16x = 128,898.56 × 128,898.56
4. Step 4: Simplify right side
   83,087.16x = 16,614,839,414.57
5. Step 5: Solve for x
   x = 16,614,839,414.57/83,087.16
6. Step 6: Final answer
   x = 199,968.81