Finding the Fourth Proportional to 5,570.64, 7,679.52 and 3,974.56

Step by Step Solution

1. Step 1: Write the proportion equation
   5,570.64 : 7,679.52 = 3,974.56 : x
2. Step 2: Convert to fraction form
   5,570.64/7,679.52 = 3,974.56/x
3. Step 3: Cross multiply
   5,570.64x = 7,679.52 × 3,974.56
4. Step 4: Simplify right side
   5,570.64x = 30,522,688.60
5. Step 5: Solve for x
   x = 30,522,688.60/5,570.64
6. Step 6: Final answer
   x = 5,479.21