Finding the Third Proportional to 118,629 and 139,542.75

Step by Step Solution

1. Step 1: Write the proportion equation
   118,629 : 139,542.75 = 139,542.75 : x
2. Step 2: Convert to fraction form
   118,629/139,542.75 = 139,542.75/x
3. Step 3: Cross multiply
   118,629x = 139,542.75 × 139,542.75
4. Step 4: Simplify right side
   118,629x = 19,472,179,077.56
5. Step 5: Solve for x
   x = 19,472,179,077.56/118,629
6. Step 6: Final answer
   x = 164,143.50