Finding the Fourth Proportional to 5,131.28, 7,686.50 and 3,816.45

Step by Step Solution

1. Step 1: Write the proportion equation
   5,131.28 : 7,686.50 = 3,816.45 : x
2. Step 2: Convert to fraction form
   5,131.28/7,686.50 = 3,816.45/x
3. Step 3: Cross multiply
   5,131.28x = 7,686.50 × 3,816.45
4. Step 4: Simplify right side
   5,131.28x = 29,335,123.84
5. Step 5: Solve for x
   x = 29,335,123.84/5,131.28
6. Step 6: Final answer
   x = 5,716.92