Finding the Third Proportional to 67,146 and 90,870

Step by Step Solution

1. Step 1: Write the proportion equation
   67,146 : 90,870 = 90,870 : x
2. Step 2: Convert to fraction form
   67,146/90,870 = 90,870/x
3. Step 3: Cross multiply
   67,146x = 90,870 × 90,870
4. Step 4: Simplify right side
   67,146x = 8,257,356,900
5. Step 5: Solve for x
   x = 8,257,356,900/67,146
6. Step 6: Final answer
   x = 122,976.15