Finding the Third Proportional to 111,778.88 and 172,690.88

Step by Step Solution

1. Step 1: Write the proportion equation
   111,778.88 : 172,690.88 = 172,690.88 : x
2. Step 2: Convert to fraction form
   111,778.88/172,690.88 = 172,690.88/x
3. Step 3: Cross multiply
   111,778.88x = 172,690.88 × 172,690.88
4. Step 4: Simplify right side
   111,778.88x = 29,822,138,308.27
5. Step 5: Solve for x
   x = 29,822,138,308.27/111,778.88
6. Step 6: Final answer
   x = 266,795.84