Finding the Fourth Proportional to 5,613.80, 7,738.94 and 3,929.98

Step by Step Solution

1. Step 1: Write the proportion equation
   5,613.80 : 7,738.94 = 3,929.98 : x
2. Step 2: Convert to fraction form
   5,613.80/7,738.94 = 3,929.98/x
3. Step 3: Cross multiply
   5,613.80x = 7,738.94 × 3,929.98
4. Step 4: Simplify right side
   5,613.80x = 30,413,879.42
5. Step 5: Solve for x
   x = 30,413,879.42/5,613.80
6. Step 6: Final answer
   x = 5,417.70