Finding the Third Proportional to 78,469 and 171,518

Step by Step Solution

1. Step 1: Write the proportion equation
   78,469 : 171,518 = 171,518 : x
2. Step 2: Convert to fraction form
   78,469/171,518 = 171,518/x
3. Step 3: Cross multiply
   78,469x = 171,518 × 171,518
4. Step 4: Simplify right side
   78,469x = 29,418,424,324
5. Step 5: Solve for x
   x = 29,418,424,324/78,469
6. Step 6: Final answer
   x = 374,905.05