Finding the Third Proportional to 1,245.38 and 1,989.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.38 : 1,989.56 = 1,989.56 : x
2. Step 2: Convert to fraction form
   1,245.38/1,989.56 = 1,989.56/x
3. Step 3: Cross multiply
   1,245.38x = 1,989.56 × 1,989.56
4. Step 4: Simplify right side
   1,245.38x = 3,958,358.94
5. Step 5: Solve for x
   x = 3,958,358.94/1,245.38
6. Step 6: Final answer
   x = 3,178.45