Finding the Fourth Proportional to 1,775.56, 2,450.17 and 978.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,775.56 : 2,450.17 = 978.85 : x
2. Step 2: Convert to fraction form
   1,775.56/2,450.17 = 978.85/x
3. Step 3: Cross multiply
   1,775.56x = 2,450.17 × 978.85
4. Step 4: Simplify right side
   1,775.56x = 2,398,348.90
5. Step 5: Solve for x
   x = 2,398,348.90/1,775.56
6. Step 6: Final answer
   x = 1,350.76