Finding the Third Proportional to 57,158 and 87,680

Step by Step Solution

1. Step 1: Write the proportion equation
   57,158 : 87,680 = 87,680 : x
2. Step 2: Convert to fraction form
   57,158/87,680 = 87,680/x
3. Step 3: Cross multiply
   57,158x = 87,680 × 87,680
4. Step 4: Simplify right side
   57,158x = 7,687,782,400
5. Step 5: Solve for x
   x = 7,687,782,400/57,158
6. Step 6: Final answer
   x = 134,500.55