Finding the Third Proportional to 111,316.78 and 172,492.03

Step by Step Solution

1. Step 1: Write the proportion equation
   111,316.78 : 172,492.03 = 172,492.03 : x
2. Step 2: Convert to fraction form
   111,316.78/172,492.03 = 172,492.03/x
3. Step 3: Cross multiply
   111,316.78x = 172,492.03 × 172,492.03
4. Step 4: Simplify right side
   111,316.78x = 29,753,500,844.75
5. Step 5: Solve for x
   x = 29,753,500,844.75/111,316.78
6. Step 6: Final answer
   x = 267,286.75