Finding the Fourth Proportional to 1,978.38, 2,967.48 and 938.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.38 : 2,967.48 = 938.88 : x
2. Step 2: Convert to fraction form
   1,978.38/2,967.48 = 938.88/x
3. Step 3: Cross multiply
   1,978.38x = 2,967.48 × 938.88
4. Step 4: Simplify right side
   1,978.38x = 2,786,107.62
5. Step 5: Solve for x
   x = 2,786,107.62/1,978.38
6. Step 6: Final answer
   x = 1,408.28