Finding the Third Proportional to 38,700 and 57,900

Step by Step Solution

1. Step 1: Write the proportion equation
   38,700 : 57,900 = 57,900 : x
2. Step 2: Convert to fraction form
   38,700/57,900 = 57,900/x
3. Step 3: Cross multiply
   38,700x = 57,900 × 57,900
4. Step 4: Simplify right side
   38,700x = 3,352,410,000
5. Step 5: Solve for x
   x = 3,352,410,000/38,700
6. Step 6: Final answer
   x = 86,625.58