Finding the Third Proportional to 66,885.75 and 89,211.38

Step by Step Solution

1. Step 1: Write the proportion equation
   66,885.75 : 89,211.38 = 89,211.38 : x
2. Step 2: Convert to fraction form
   66,885.75/89,211.38 = 89,211.38/x
3. Step 3: Cross multiply
   66,885.75x = 89,211.38 × 89,211.38
4. Step 4: Simplify right side
   66,885.75x = 7,958,669,429.39
5. Step 5: Solve for x
   x = 7,958,669,429.39/66,885.75
6. Step 6: Final answer
   x = 118,989.01