Finding the Fourth Proportional to 5,171.47, 7,698.72 and 5,140.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,171.47 : 7,698.72 = 5,140.72 : x
2. Step 2: Convert to fraction form
   5,171.47/7,698.72 = 5,140.72/x
3. Step 3: Cross multiply
   5,171.47x = 7,698.72 × 5,140.72
4. Step 4: Simplify right side
   5,171.47x = 39,576,918.93
5. Step 5: Solve for x
   x = 39,576,918.93/5,171.47
6. Step 6: Final answer
   x = 7,652.93