Finding the Fourth Proportional to 7,042.23, 9,718.17 and 3,855.57

Step by Step Solution

1. Step 1: Write the proportion equation
   7,042.23 : 9,718.17 = 3,855.57 : x
2. Step 2: Convert to fraction form
   7,042.23/9,718.17 = 3,855.57/x
3. Step 3: Cross multiply
   7,042.23x = 9,718.17 × 3,855.57
4. Step 4: Simplify right side
   7,042.23x = 37,469,084.71
5. Step 5: Solve for x
   x = 37,469,084.71/7,042.23
6. Step 6: Final answer
   x = 5,320.63