Finding the Fourth Proportional to 3,147.91, 4,725.15 and 3,077.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,147.91 : 4,725.15 = 3,077.31 : x
2. Step 2: Convert to fraction form
   3,147.91/4,725.15 = 3,077.31/x
3. Step 3: Cross multiply
   3,147.91x = 4,725.15 × 3,077.31
4. Step 4: Simplify right side
   3,147.91x = 14,540,757.53
5. Step 5: Solve for x
   x = 14,540,757.53/3,147.91
6. Step 6: Final answer
   x = 4,619.18