Finding the Third Proportional to 113,815 and 172,288

Step by Step Solution

1. Step 1: Write the proportion equation
   113,815 : 172,288 = 172,288 : x
2. Step 2: Convert to fraction form
   113,815/172,288 = 172,288/x
3. Step 3: Cross multiply
   113,815x = 172,288 × 172,288
4. Step 4: Simplify right side
   113,815x = 29,683,154,944
5. Step 5: Solve for x
   x = 29,683,154,944/113,815
6. Step 6: Final answer
   x = 260,801.78