Finding the Fourth Proportional to 9,928.72, 13,791.46 and 9,769.96

Step by Step Solution

1. Step 1: Write the proportion equation
   9,928.72 : 13,791.46 = 9,769.96 : x
2. Step 2: Convert to fraction form
   9,928.72/13,791.46 = 9,769.96/x
3. Step 3: Cross multiply
   9,928.72x = 13,791.46 × 9,769.96
4. Step 4: Simplify right side
   9,928.72x = 134,742,012.54
5. Step 5: Solve for x
   x = 134,742,012.54/9,928.72
6. Step 6: Final answer
   x = 13,570.93