Finding the Fourth Proportional to 1,764.48, 2,435.13 and 978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.48 : 2,435.13 = 978.60 : x
2. Step 2: Convert to fraction form
   1,764.48/2,435.13 = 978.60/x
3. Step 3: Cross multiply
   1,764.48x = 2,435.13 × 978.60
4. Step 4: Simplify right side
   1,764.48x = 2,383,018.22
5. Step 5: Solve for x
   x = 2,383,018.22/1,764.48
6. Step 6: Final answer
   x = 1,350.55