Finding the Third Proportional to 128,049 and 139,530.75

Step by Step Solution

1. Step 1: Write the proportion equation
   128,049 : 139,530.75 = 139,530.75 : x
2. Step 2: Convert to fraction form
   128,049/139,530.75 = 139,530.75/x
3. Step 3: Cross multiply
   128,049x = 139,530.75 × 139,530.75
4. Step 4: Simplify right side
   128,049x = 19,468,830,195.56
5. Step 5: Solve for x
   x = 19,468,830,195.56/128,049
6. Step 6: Final answer
   x = 152,042.03