Finding the Third Proportional to 976.50 and 2,139.38

Step by Step Solution

1. Step 1: Write the proportion equation
   976.50 : 2,139.38 = 2,139.38 : x
2. Step 2: Convert to fraction form
   976.50/2,139.38 = 2,139.38/x
3. Step 3: Cross multiply
   976.50x = 2,139.38 × 2,139.38
4. Step 4: Simplify right side
   976.50x = 4,576,925.39
5. Step 5: Solve for x
   x = 4,576,925.39/976.50
6. Step 6: Final answer
   x = 4,687.07