Finding the Third Proportional to 111,687 and 243,072

Step by Step Solution

1. Step 1: Write the proportion equation
   111,687 : 243,072 = 243,072 : x
2. Step 2: Convert to fraction form
   111,687/243,072 = 243,072/x
3. Step 3: Cross multiply
   111,687x = 243,072 × 243,072
4. Step 4: Simplify right side
   111,687x = 59,083,997,184
5. Step 5: Solve for x
   x = 59,083,997,184/111,687
6. Step 6: Final answer
   x = 529,014.09