Finding the Fourth Proportional to 1,171.56, 1,616.98 and 1,078.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.56 : 1,616.98 = 1,078.15 : x
2. Step 2: Convert to fraction form
   1,171.56/1,616.98 = 1,078.15/x
3. Step 3: Cross multiply
   1,171.56x = 1,616.98 × 1,078.15
4. Step 4: Simplify right side
   1,171.56x = 1,743,346.99
5. Step 5: Solve for x
   x = 1,743,346.99/1,171.56
6. Step 6: Final answer
   x = 1,488.06