Finding the Fourth Proportional to 1,764.96, 2,435.60 and 978.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.96 : 2,435.60 = 978.96 : x
2. Step 2: Convert to fraction form
   1,764.96/2,435.60 = 978.96/x
3. Step 3: Cross multiply
   1,764.96x = 2,435.60 × 978.96
4. Step 4: Simplify right side
   1,764.96x = 2,384,354.98
5. Step 5: Solve for x
   x = 2,384,354.98/1,764.96
6. Step 6: Final answer
   x = 1,350.94