Finding the Fourth Proportional to 2,779.69, 4,171.59 and 1,318.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,779.69 : 4,171.59 = 1,318.85 : x
2. Step 2: Convert to fraction form
   2,779.69/4,171.59 = 1,318.85/x
3. Step 3: Cross multiply
   2,779.69x = 4,171.59 × 1,318.85
4. Step 4: Simplify right side
   2,779.69x = 5,501,701.47
5. Step 5: Solve for x
   x = 5,501,701.47/2,779.69
6. Step 6: Final answer
   x = 1,979.25