Finding the Fourth Proportional to 11,626.78, 17,438.30 and 3,191.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,626.78 : 17,438.30 = 3,191.31 : x
2. Step 2: Convert to fraction form
   11,626.78/17,438.30 = 3,191.31/x
3. Step 3: Cross multiply
   11,626.78x = 17,438.30 × 3,191.31
4. Step 4: Simplify right side
   11,626.78x = 55,651,064.77
5. Step 5: Solve for x
   x = 55,651,064.77/11,626.78
6. Step 6: Final answer
   x = 4,786.46