Finding the Fourth Proportional to 7,105.76, 9,805.38 and 3,918.56

Step by Step Solution

1. Step 1: Write the proportion equation
   7,105.76 : 9,805.38 = 3,918.56 : x
2. Step 2: Convert to fraction form
   7,105.76/9,805.38 = 3,918.56/x
3. Step 3: Cross multiply
   7,105.76x = 9,805.38 × 3,918.56
4. Step 4: Simplify right side
   7,105.76x = 38,422,969.85
5. Step 5: Solve for x
   x = 38,422,969.85/7,105.76
6. Step 6: Final answer
   x = 5,407.30