Finding the Fourth Proportional to 5,271.86, 7,905.47 and 2,806.10

Step by Step Solution

1. Step 1: Write the proportion equation
   5,271.86 : 7,905.47 = 2,806.10 : x
2. Step 2: Convert to fraction form
   5,271.86/7,905.47 = 2,806.10/x
3. Step 3: Cross multiply
   5,271.86x = 7,905.47 × 2,806.10
4. Step 4: Simplify right side
   5,271.86x = 22,183,499.84
5. Step 5: Solve for x
   x = 22,183,499.84/5,271.86
6. Step 6: Final answer
   x = 4,207.91