Finding the Fourth Proportional to 5,164.71, 7,127.28 and 2,806.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5,164.71 : 7,127.28 = 2,806.89 : x
2. Step 2: Convert to fraction form
   5,164.71/7,127.28 = 2,806.89/x
3. Step 3: Cross multiply
   5,164.71x = 7,127.28 × 2,806.89
4. Step 4: Simplify right side
   5,164.71x = 20,005,490.96
5. Step 5: Solve for x
   x = 20,005,490.96/5,164.71
6. Step 6: Final answer
   x = 3,873.50