Finding the Fourth Proportional to 3,402.91, 5,078.50 and 3,315.43

Step by Step Solution

1. Step 1: Write the proportion equation
   3,402.91 : 5,078.50 = 3,315.43 : x
2. Step 2: Convert to fraction form
   3,402.91/5,078.50 = 3,315.43/x
3. Step 3: Cross multiply
   3,402.91x = 5,078.50 × 3,315.43
4. Step 4: Simplify right side
   3,402.91x = 16,837,411.26
5. Step 5: Solve for x
   x = 16,837,411.26/3,402.91
6. Step 6: Final answer
   x = 4,947.94