Finding the Fourth Proportional to 12,556.91, 18,838.41 and 3,791.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,556.91 : 18,838.41 = 3,791.30 : x
2. Step 2: Convert to fraction form
   12,556.91/18,838.41 = 3,791.30/x
3. Step 3: Cross multiply
   12,556.91x = 18,838.41 × 3,791.30
4. Step 4: Simplify right side
   12,556.91x = 71,422,063.83
5. Step 5: Solve for x
   x = 71,422,063.83/12,556.91
6. Step 6: Final answer
   x = 5,687.87