Finding the Fourth Proportional to 7,131.77, 9,841.28 and 3,945.08

Step by Step Solution

1. Step 1: Write the proportion equation
   7,131.77 : 9,841.28 = 3,945.08 : x
2. Step 2: Convert to fraction form
   7,131.77/9,841.28 = 3,945.08/x
3. Step 3: Cross multiply
   7,131.77x = 9,841.28 × 3,945.08
4. Step 4: Simplify right side
   7,131.77x = 38,824,641.78
5. Step 5: Solve for x
   x = 38,824,641.78/7,131.77
6. Step 6: Final answer
   x = 5,443.90