Finding the Fourth Proportional to 7,928.80, 10,947.12 and 7,086.82

Step by Step Solution

1. Step 1: Write the proportion equation
   7,928.80 : 10,947.12 = 7,086.82 : x
2. Step 2: Convert to fraction form
   7,928.80/10,947.12 = 7,086.82/x
3. Step 3: Cross multiply
   7,928.80x = 10,947.12 × 7,086.82
4. Step 4: Simplify right side
   7,928.80x = 77,580,268.96
5. Step 5: Solve for x
   x = 77,580,268.96/7,928.80
6. Step 6: Final answer
   x = 9,784.62