Finding the Fourth Proportional to 5,178.39, 7,146.18 and 2,820.54

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178.39 : 7,146.18 = 2,820.54 : x
2. Step 2: Convert to fraction form
   5,178.39/7,146.18 = 2,820.54/x
3. Step 3: Cross multiply
   5,178.39x = 7,146.18 × 2,820.54
4. Step 4: Simplify right side
   5,178.39x = 20,156,086.54
5. Step 5: Solve for x
   x = 20,156,086.54/5,178.39
6. Step 6: Final answer
   x = 3,892.35