Finding the Third Proportional to 128,047.50 and 139,529.25

Step by Step Solution

1. Step 1: Write the proportion equation
   128,047.50 : 139,529.25 = 139,529.25 : x
2. Step 2: Convert to fraction form
   128,047.50/139,529.25 = 139,529.25/x
3. Step 3: Cross multiply
   128,047.50x = 139,529.25 × 139,529.25
4. Step 4: Simplify right side
   128,047.50x = 19,468,411,605.56
5. Step 5: Solve for x
   x = 19,468,411,605.56/128,047.50
6. Step 6: Final answer
   x = 152,040.54