Finding the Third Proportional to 66,144 and 89,818

Step by Step Solution

1. Step 1: Write the proportion equation
   66,144 : 89,818 = 89,818 : x
2. Step 2: Convert to fraction form
   66,144/89,818 = 89,818/x
3. Step 3: Cross multiply
   66,144x = 89,818 × 89,818
4. Step 4: Simplify right side
   66,144x = 8,067,273,124
5. Step 5: Solve for x
   x = 8,067,273,124/66,144
6. Step 6: Final answer
   x = 121,965.30