Finding the Third Proportional to 78,164 and 121,116

Step by Step Solution

1. Step 1: Write the proportion equation
   78,164 : 121,116 = 121,116 : x
2. Step 2: Convert to fraction form
   78,164/121,116 = 121,116/x
3. Step 3: Cross multiply
   78,164x = 121,116 × 121,116
4. Step 4: Simplify right side
   78,164x = 14,669,085,456
5. Step 5: Solve for x
   x = 14,669,085,456/78,164
6. Step 6: Final answer
   x = 187,670.61