Finding the Fourth Proportional to 7,105.29, 9,805.41 and 3,918.57

Step by Step Solution

1. Step 1: Write the proportion equation
   7,105.29 : 9,805.41 = 3,918.57 : x
2. Step 2: Convert to fraction form
   7,105.29/9,805.41 = 3,918.57/x
3. Step 3: Cross multiply
   7,105.29x = 9,805.41 × 3,918.57
4. Step 4: Simplify right side
   7,105.29x = 38,423,185.46
5. Step 5: Solve for x
   x = 38,423,185.46/7,105.29
6. Step 6: Final answer
   x = 5,407.69