Finding the Fourth Proportional to 1,764.65, 2,435.20 and 978.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.65 : 2,435.20 = 978.69 : x
2. Step 2: Convert to fraction form
   1,764.65/2,435.20 = 978.69/x
3. Step 3: Cross multiply
   1,764.65x = 2,435.20 × 978.69
4. Step 4: Simplify right side
   1,764.65x = 2,383,305.89
5. Step 5: Solve for x
   x = 2,383,305.89/1,764.65
6. Step 6: Final answer
   x = 1,350.58