Finding the Fourth Proportional to 1,764.78, 2,435.33 and 978.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.78 : 2,435.33 = 978.77 : x
2. Step 2: Convert to fraction form
   1,764.78/2,435.33 = 978.77/x
3. Step 3: Cross multiply
   1,764.78x = 2,435.33 × 978.77
4. Step 4: Simplify right side
   1,764.78x = 2,383,627.94
5. Step 5: Solve for x
   x = 2,383,627.94/1,764.78
6. Step 6: Final answer
   x = 1,350.67