Finding the Third Proportional to 57,178.50 and 81,690.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,178.50 : 81,690.75 = 81,690.75 : x
2. Step 2: Convert to fraction form
   57,178.50/81,690.75 = 81,690.75/x
3. Step 3: Cross multiply
   57,178.50x = 81,690.75 × 81,690.75
4. Step 4: Simplify right side
   57,178.50x = 6,673,378,635.56
5. Step 5: Solve for x
   x = 6,673,378,635.56/57,178.50
6. Step 6: Final answer
   x = 116,711.33