Finding the Third Proportional to 111,321 and 172,165.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,321 : 172,165.50 = 172,165.50 : x
2. Step 2: Convert to fraction form
   111,321/172,165.50 = 172,165.50/x
3. Step 3: Cross multiply
   111,321x = 172,165.50 × 172,165.50
4. Step 4: Simplify right side
   111,321x = 29,640,959,390.25
5. Step 5: Solve for x
   x = 29,640,959,390.25/111,321
6. Step 6: Final answer
   x = 266,265.66