Finding the Third Proportional to 118,215 and 172,921.50

Step by Step Solution

1. Step 1: Write the proportion equation
   118,215 : 172,921.50 = 172,921.50 : x
2. Step 2: Convert to fraction form
   118,215/172,921.50 = 172,921.50/x
3. Step 3: Cross multiply
   118,215x = 172,921.50 × 172,921.50
4. Step 4: Simplify right side
   118,215x = 29,901,845,162.25
5. Step 5: Solve for x
   x = 29,901,845,162.25/118,215
6. Step 6: Final answer
   x = 252,944.59