Finding the Third Proportional to 57,145.50 and 89,358.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,145.50 : 89,358.75 = 89,358.75 : x
2. Step 2: Convert to fraction form
   57,145.50/89,358.75 = 89,358.75/x
3. Step 3: Cross multiply
   57,145.50x = 89,358.75 × 89,358.75
4. Step 4: Simplify right side
   57,145.50x = 7,984,986,201.56
5. Step 5: Solve for x
   x = 7,984,986,201.56/57,145.50
6. Step 6: Final answer
   x = 139,730.80