Finding the Third Proportional to 100,215 and 155,142

Step by Step Solution

1. Step 1: Write the proportion equation
   100,215 : 155,142 = 155,142 : x
2. Step 2: Convert to fraction form
   100,215/155,142 = 155,142/x
3. Step 3: Cross multiply
   100,215x = 155,142 × 155,142
4. Step 4: Simplify right side
   100,215x = 24,069,040,164
5. Step 5: Solve for x
   x = 24,069,040,164/100,215
6. Step 6: Final answer
   x = 240,174.03