Finding the Third Proportional to 55,009.13 and 83,128.78

Step by Step Solution

1. Step 1: Write the proportion equation
   55,009.13 : 83,128.78 = 83,128.78 : x
2. Step 2: Convert to fraction form
   55,009.13/83,128.78 = 83,128.78/x
3. Step 3: Cross multiply
   55,009.13x = 83,128.78 × 83,128.78
4. Step 4: Simplify right side
   55,009.13x = 6,910,394,272.11
5. Step 5: Solve for x
   x = 6,910,394,272.11/55,009.13
6. Step 6: Final answer
   x = 125,622.69