Finding the Fourth Proportional to 7,091.60, 9,785.94 and 3,947.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,091.60 : 9,785.94 = 3,947.72 : x
2. Step 2: Convert to fraction form
   7,091.60/9,785.94 = 3,947.72/x
3. Step 3: Cross multiply
   7,091.60x = 9,785.94 × 3,947.72
4. Step 4: Simplify right side
   7,091.60x = 38,632,151.06
5. Step 5: Solve for x
   x = 38,632,151.06/7,091.60
6. Step 6: Final answer
   x = 5,447.59