Finding the Fourth Proportional to 5,123.15, 7,068.41 and 3,131.61

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.15 : 7,068.41 = 3,131.61 : x
2. Step 2: Convert to fraction form
   5,123.15/7,068.41 = 3,131.61/x
3. Step 3: Cross multiply
   5,123.15x = 7,068.41 × 3,131.61
4. Step 4: Simplify right side
   5,123.15x = 22,135,530.39
5. Step 5: Solve for x
   x = 22,135,530.39/5,123.15
6. Step 6: Final answer
   x = 4,320.69