Finding the Fourth Proportional to 12,684.21, 17,506.96 and 7,379.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,684.21 : 17,506.96 = 7,379.72 : x
2. Step 2: Convert to fraction form
   12,684.21/17,506.96 = 7,379.72/x
3. Step 3: Cross multiply
   12,684.21x = 17,506.96 × 7,379.72
4. Step 4: Simplify right side
   12,684.21x = 129,196,462.85
5. Step 5: Solve for x
   x = 129,196,462.85/12,684.21
6. Step 6: Final answer
   x = 10,185.61