Finding the Third Proportional to 118,638 and 139,551.75

Step by Step Solution

1. Step 1: Write the proportion equation
   118,638 : 139,551.75 = 139,551.75 : x
2. Step 2: Convert to fraction form
   118,638/139,551.75 = 139,551.75/x
3. Step 3: Cross multiply
   118,638x = 139,551.75 × 139,551.75
4. Step 4: Simplify right side
   118,638x = 19,474,690,928.06
5. Step 5: Solve for x
   x = 19,474,690,928.06/118,638
6. Step 6: Final answer
   x = 164,152.22