Finding the Fourth Proportional to 7,145.37, 10,720.87 and 5,173.47

Step by Step Solution

1. Step 1: Write the proportion equation
   7,145.37 : 10,720.87 = 5,173.47 : x
2. Step 2: Convert to fraction form
   7,145.37/10,720.87 = 5,173.47/x
3. Step 3: Cross multiply
   7,145.37x = 10,720.87 × 5,173.47
4. Step 4: Simplify right side
   7,145.37x = 55,464,086.39
5. Step 5: Solve for x
   x = 55,464,086.39/7,145.37
6. Step 6: Final answer
   x = 7,762.24