Finding the Fourth Proportional to 5,178.48, 7,146.72 and 3,189.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178.48 : 7,146.72 = 3,189.72 : x
2. Step 2: Convert to fraction form
   5,178.48/7,146.72 = 3,189.72/x
3. Step 3: Cross multiply
   5,178.48x = 7,146.72 × 3,189.72
4. Step 4: Simplify right side
   5,178.48x = 22,796,035.72
5. Step 5: Solve for x
   x = 22,796,035.72/5,178.48
6. Step 6: Final answer
   x = 4,402.07