Finding the Fourth Proportional to 6,443.72, 8,870.92 and 5,779.42

Step by Step Solution

1. Step 1: Write the proportion equation
   6,443.72 : 8,870.92 = 5,779.42 : x
2. Step 2: Convert to fraction form
   6,443.72/8,870.92 = 5,779.42/x
3. Step 3: Cross multiply
   6,443.72x = 8,870.92 × 5,779.42
4. Step 4: Simplify right side
   6,443.72x = 51,268,742.56
5. Step 5: Solve for x
   x = 51,268,742.56/6,443.72
6. Step 6: Final answer
   x = 7,956.39