Finding the Fourth Proportional to 5,168.70, 7,130.61 and 3,178.62

Step by Step Solution

1. Step 1: Write the proportion equation
   5,168.70 : 7,130.61 = 3,178.62 : x
2. Step 2: Convert to fraction form
   5,168.70/7,130.61 = 3,178.62/x
3. Step 3: Cross multiply
   5,168.70x = 7,130.61 × 3,178.62
4. Step 4: Simplify right side
   5,168.70x = 22,665,499.56
5. Step 5: Solve for x
   x = 22,665,499.56/5,168.70
6. Step 6: Final answer
   x = 4,385.15