Finding the Fourth Proportional to 6,870.20, 9,479.79 and 4,040.00

Step by Step Solution

1. Step 1: Write the proportion equation
   6,870.20 : 9,479.79 = 4,040.00 : x
2. Step 2: Convert to fraction form
   6,870.20/9,479.79 = 4,040.00/x
3. Step 3: Cross multiply
   6,870.20x = 9,479.79 × 4,040.00
4. Step 4: Simplify right side
   6,870.20x = 38,298,284.00
5. Step 5: Solve for x
   x = 38,298,284.00/6,870.20
6. Step 6: Final answer
   x = 5,574.56