Finding the Third Proportional to 128,055.75 and 139,537.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,055.75 : 139,537.50 = 139,537.50 : x
2. Step 2: Convert to fraction form
   128,055.75/139,537.50 = 139,537.50/x
3. Step 3: Cross multiply
   128,055.75x = 139,537.50 × 139,537.50
4. Step 4: Simplify right side
   128,055.75x = 19,470,713,906.25
5. Step 5: Solve for x
   x = 19,470,713,906.25/128,055.75
6. Step 6: Final answer
   x = 152,048.73