Finding the Third Proportional to 42,909 and 57,987

Step by Step Solution

1. Step 1: Write the proportion equation
   42,909 : 57,987 = 57,987 : x
2. Step 2: Convert to fraction form
   42,909/57,987 = 57,987/x
3. Step 3: Cross multiply
   42,909x = 57,987 × 57,987
4. Step 4: Simplify right side
   42,909x = 3,362,492,169
5. Step 5: Solve for x
   x = 3,362,492,169/42,909
6. Step 6: Final answer
   x = 78,363.33