Finding the Fourth Proportional to 5,103.83, 7,658.60 and 3,990.08

Step by Step Solution

1. Step 1: Write the proportion equation
   5,103.83 : 7,658.60 = 3,990.08 : x
2. Step 2: Convert to fraction form
   5,103.83/7,658.60 = 3,990.08/x
3. Step 3: Cross multiply
   5,103.83x = 7,658.60 × 3,990.08
4. Step 4: Simplify right side
   5,103.83x = 30,558,425.88
5. Step 5: Solve for x
   x = 30,558,425.88/5,103.83
6. Step 6: Final answer
   x = 5,987.35