Finding the Fourth Proportional to 1,273.28, 1,757.56 and 978.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,273.28 : 1,757.56 = 978.16 : x
2. Step 2: Convert to fraction form
   1,273.28/1,757.56 = 978.16/x
3. Step 3: Cross multiply
   1,273.28x = 1,757.56 × 978.16
4. Step 4: Simplify right side
   1,273.28x = 1,719,174.89
5. Step 5: Solve for x
   x = 1,719,174.89/1,273.28
6. Step 6: Final answer
   x = 1,350.19