Finding the Fourth Proportional to 5,679.89, 8,521.25 and 5,585.71

Step by Step Solution

1. Step 1: Write the proportion equation
   5,679.89 : 8,521.25 = 5,585.71 : x
2. Step 2: Convert to fraction form
   5,679.89/8,521.25 = 5,585.71/x
3. Step 3: Cross multiply
   5,679.89x = 8,521.25 × 5,585.71
4. Step 4: Simplify right side
   5,679.89x = 47,597,231.34
5. Step 5: Solve for x
   x = 47,597,231.34/5,679.89
6. Step 6: Final answer
   x = 8,379.96