Finding the Fourth Proportional to 12,211.34, 18,317.15 and 3,891.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,211.34 : 18,317.15 = 3,891.30 : x
2. Step 2: Convert to fraction form
   12,211.34/18,317.15 = 3,891.30/x
3. Step 3: Cross multiply
   12,211.34x = 18,317.15 × 3,891.30
4. Step 4: Simplify right side
   12,211.34x = 71,277,506.34
5. Step 5: Solve for x
   x = 71,277,506.34/12,211.34
6. Step 6: Final answer
   x = 5,837.00