Finding the Fourth Proportional to 12,506.67, 17,266.37 and 9,980.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,506.67 : 17,266.37 = 9,980.69 : x
2. Step 2: Convert to fraction form
   12,506.67/17,266.37 = 9,980.69/x
3. Step 3: Cross multiply
   12,506.67x = 17,266.37 × 9,980.69
4. Step 4: Simplify right side
   12,506.67x = 172,330,150.16
5. Step 5: Solve for x
   x = 172,330,150.16/12,506.67
6. Step 6: Final answer
   x = 13,779.06