Finding the Fourth Proportional to 3,499.56, 4,807.78 and 3,131.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,499.56 : 4,807.78 = 3,131.42 : x
2. Step 2: Convert to fraction form
   3,499.56/4,807.78 = 3,131.42/x
3. Step 3: Cross multiply
   3,499.56x = 4,807.78 × 3,131.42
4. Step 4: Simplify right side
   3,499.56x = 15,055,178.45
5. Step 5: Solve for x
   x = 15,055,178.45/3,499.56
6. Step 6: Final answer
   x = 4,302.02