Finding the Fourth Proportional to 5,679.71, 7,837.61 and 3,555.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,679.71 : 7,837.61 = 3,555.15 : x
2. Step 2: Convert to fraction form
   5,679.71/7,837.61 = 3,555.15/x
3. Step 3: Cross multiply
   5,679.71x = 7,837.61 × 3,555.15
4. Step 4: Simplify right side
   5,679.71x = 27,863,861.42
5. Step 5: Solve for x
   x = 27,863,861.42/5,679.71
6. Step 6: Final answer
   x = 4,905.86