Finding the Third Proportional to 912.38 and 1,978.13

Step by Step Solution

1. Step 1: Write the proportion equation
   912.38 : 1,978.13 = 1,978.13 : x
2. Step 2: Convert to fraction form
   912.38/1,978.13 = 1,978.13/x
3. Step 3: Cross multiply
   912.38x = 1,978.13 × 1,978.13
4. Step 4: Simplify right side
   912.38x = 3,912,978.52
5. Step 5: Solve for x
   x = 3,912,978.52/912.38
6. Step 6: Final answer
   x = 4,288.78