Finding the Fourth Proportional to 1,764.28, 2,434.75 and 978.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.28 : 2,434.75 = 978.31 : x
2. Step 2: Convert to fraction form
   1,764.28/2,434.75 = 978.31/x
3. Step 3: Cross multiply
   1,764.28x = 2,434.75 × 978.31
4. Step 4: Simplify right side
   1,764.28x = 2,381,940.87
5. Step 5: Solve for x
   x = 2,381,940.87/1,764.28
6. Step 6: Final answer
   x = 1,350.09