Finding the Fourth Proportional to 1,764.28, 2,434.71 and 978.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.28 : 2,434.71 = 978.38 : x
2. Step 2: Convert to fraction form
   1,764.28/2,434.71 = 978.38/x
3. Step 3: Cross multiply
   1,764.28x = 2,434.71 × 978.38
4. Step 4: Simplify right side
   1,764.28x = 2,382,066.69
5. Step 5: Solve for x
   x = 2,382,066.69/1,764.28
6. Step 6: Final answer
   x = 1,350.16