Finding the Fourth Proportional to 1,764.71, 2,435.30 and 978.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.71 : 2,435.30 = 978.75 : x
2. Step 2: Convert to fraction form
   1,764.71/2,435.30 = 978.75/x
3. Step 3: Cross multiply
   1,764.71x = 2,435.30 × 978.75
4. Step 4: Simplify right side
   1,764.71x = 2,383,549.88
5. Step 5: Solve for x
   x = 2,383,549.88/1,764.71
6. Step 6: Final answer
   x = 1,350.68