Finding the Third Proportional to 118,213 and 172,918.50

Step by Step Solution

1. Step 1: Write the proportion equation
   118,213 : 172,918.50 = 172,918.50 : x
2. Step 2: Convert to fraction form
   118,213/172,918.50 = 172,918.50/x
3. Step 3: Cross multiply
   118,213x = 172,918.50 × 172,918.50
4. Step 4: Simplify right side
   118,213x = 29,900,807,642.25
5. Step 5: Solve for x
   x = 29,900,807,642.25/118,213
6. Step 6: Final answer
   x = 252,940.10