Finding the Fourth Proportional to 5,173.36, 7,139.27 and 2,815.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,173.36 : 7,139.27 = 2,815.50 : x
2. Step 2: Convert to fraction form
   5,173.36/7,139.27 = 2,815.50/x
3. Step 3: Cross multiply
   5,173.36x = 7,139.27 × 2,815.50
4. Step 4: Simplify right side
   5,173.36x = 20,100,600.61
5. Step 5: Solve for x
   x = 20,100,600.61/5,173.36
6. Step 6: Final answer
   x = 3,885.41