Finding the Fourth Proportional to 5,178.76, 7,146.72 and 2,820.92

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178.76 : 7,146.72 = 2,820.92 : x
2. Step 2: Convert to fraction form
   5,178.76/7,146.72 = 2,820.92/x
3. Step 3: Cross multiply
   5,178.76x = 7,146.72 × 2,820.92
4. Step 4: Simplify right side
   5,178.76x = 20,160,325.38
5. Step 5: Solve for x
   x = 20,160,325.38/5,178.76
6. Step 6: Final answer
   x = 3,892.89