Finding the Third Proportional to 35,878 and 78,215

Step by Step Solution

1. Step 1: Write the proportion equation
   35,878 : 78,215 = 78,215 : x
2. Step 2: Convert to fraction form
   35,878/78,215 = 78,215/x
3. Step 3: Cross multiply
   35,878x = 78,215 × 78,215
4. Step 4: Simplify right side
   35,878x = 6,117,586,225
5. Step 5: Solve for x
   x = 6,117,586,225/35,878
6. Step 6: Final answer
   x = 170,510.79