Finding the Fourth Proportional to 1,764.39, 2,434.98 and 978.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.39 : 2,434.98 = 978.55 : x
2. Step 2: Convert to fraction form
   1,764.39/2,434.98 = 978.55/x
3. Step 3: Cross multiply
   1,764.39x = 2,434.98 × 978.55
4. Step 4: Simplify right side
   1,764.39x = 2,382,749.68
5. Step 5: Solve for x
   x = 2,382,749.68/1,764.39
6. Step 6: Final answer
   x = 1,350.47