Finding the Fourth Proportional to 1,775.20, 2,449.82 and 978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,775.20 : 2,449.82 = 978.56 : x
2. Step 2: Convert to fraction form
   1,775.20/2,449.82 = 978.56/x
3. Step 3: Cross multiply
   1,775.20x = 2,449.82 × 978.56
4. Step 4: Simplify right side
   1,775.20x = 2,397,295.86
5. Step 5: Solve for x
   x = 2,397,295.86/1,775.20
6. Step 6: Final answer
   x = 1,350.44