Finding the Third Proportional to 128,863.50 and 140,545.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,863.50 : 140,545.50 = 140,545.50 : x
2. Step 2: Convert to fraction form
   128,863.50/140,545.50 = 140,545.50/x
3. Step 3: Cross multiply
   128,863.50x = 140,545.50 × 140,545.50
4. Step 4: Simplify right side
   128,863.50x = 19,753,037,570.25
5. Step 5: Solve for x
   x = 19,753,037,570.25/128,863.50
6. Step 6: Final answer
   x = 153,286.52