Finding the Third Proportional to 72,781 and 111,115

Step by Step Solution

1. Step 1: Write the proportion equation
   72,781 : 111,115 = 111,115 : x
2. Step 2: Convert to fraction form
   72,781/111,115 = 111,115/x
3. Step 3: Cross multiply
   72,781x = 111,115 × 111,115
4. Step 4: Simplify right side
   72,781x = 12,346,543,225
5. Step 5: Solve for x
   x = 12,346,543,225/72,781
6. Step 6: Final answer
   x = 169,639.65