Finding the Fourth Proportional to 5,820.89, 8,686.62 and 5,198.09

Step by Step Solution

1. Step 1: Write the proportion equation
   5,820.89 : 8,686.62 = 5,198.09 : x
2. Step 2: Convert to fraction form
   5,820.89/8,686.62 = 5,198.09/x
3. Step 3: Cross multiply
   5,820.89x = 8,686.62 × 5,198.09
4. Step 4: Simplify right side
   5,820.89x = 45,153,806.57
5. Step 5: Solve for x
   x = 45,153,806.57/5,820.89
6. Step 6: Final answer
   x = 7,757.20