Finding the Fourth Proportional to 2,913.69, 4,020.89 and 1,587.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,913.69 : 4,020.89 = 1,587.39 : x
2. Step 2: Convert to fraction form
   2,913.69/4,020.89 = 1,587.39/x
3. Step 3: Cross multiply
   2,913.69x = 4,020.89 × 1,587.39
4. Step 4: Simplify right side
   2,913.69x = 6,382,697.56
5. Step 5: Solve for x
   x = 6,382,697.56/2,913.69
6. Step 6: Final answer
   x = 2,190.59