Finding the Fourth Proportional to 1,764.69, 2,435.31 and 978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.69 : 2,435.31 = 978.72 : x
2. Step 2: Convert to fraction form
   1,764.69/2,435.31 = 978.72/x
3. Step 3: Cross multiply
   1,764.69x = 2,435.31 × 978.72
4. Step 4: Simplify right side
   1,764.69x = 2,383,486.60
5. Step 5: Solve for x
   x = 2,383,486.60/1,764.69
6. Step 6: Final answer
   x = 1,350.65