Finding the Fourth Proportional to 8,505.57, 11,735.87 and 5,147.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,505.57 : 11,735.87 = 5,147.72 : x
2. Step 2: Convert to fraction form
   8,505.57/11,735.87 = 5,147.72/x
3. Step 3: Cross multiply
   8,505.57x = 11,735.87 × 5,147.72
4. Step 4: Simplify right side
   8,505.57x = 60,412,972.72
5. Step 5: Solve for x
   x = 60,412,972.72/8,505.57
6. Step 6: Final answer
   x = 7,102.75