Finding the Fourth Proportional to 5,158.59, 7,721.48 and 3,690.56

Step by Step Solution

1. Step 1: Write the proportion equation
   5,158.59 : 7,721.48 = 3,690.56 : x
2. Step 2: Convert to fraction form
   5,158.59/7,721.48 = 3,690.56/x
3. Step 3: Cross multiply
   5,158.59x = 7,721.48 × 3,690.56
4. Step 4: Simplify right side
   5,158.59x = 28,496,593.00
5. Step 5: Solve for x
   x = 28,496,593.00/5,158.59
6. Step 6: Final answer
   x = 5,524.11