Finding the Fourth Proportional to 6,281.94, 8,660.61 and 5,215.89

Step by Step Solution

1. Step 1: Write the proportion equation
   6,281.94 : 8,660.61 = 5,215.89 : x
2. Step 2: Convert to fraction form
   6,281.94/8,660.61 = 5,215.89/x
3. Step 3: Cross multiply
   6,281.94x = 8,660.61 × 5,215.89
4. Step 4: Simplify right side
   6,281.94x = 45,172,789.09
5. Step 5: Solve for x
   x = 45,172,789.09/6,281.94
6. Step 6: Final answer
   x = 7,190.90