Finding the Fourth Proportional to 7,072.14, 9,759.72 and 3,928.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,072.14 : 9,759.72 = 3,928.50 : x
2. Step 2: Convert to fraction form
   7,072.14/9,759.72 = 3,928.50/x
3. Step 3: Cross multiply
   7,072.14x = 9,759.72 × 3,928.50
4. Step 4: Simplify right side
   7,072.14x = 38,341,060.02
5. Step 5: Solve for x
   x = 38,341,060.02/7,072.14
6. Step 6: Final answer
   x = 5,421.42