Finding the Fourth Proportional to 12,986.10, 17,921.01 and 7,396.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986.10 : 17,921.01 = 7,396.98 : x
2. Step 2: Convert to fraction form
   12,986.10/17,921.01 = 7,396.98/x
3. Step 3: Cross multiply
   12,986.10x = 17,921.01 × 7,396.98
4. Step 4: Simplify right side
   12,986.10x = 132,561,352.55
5. Step 5: Solve for x
   x = 132,561,352.55/12,986.10
6. Step 6: Final answer
   x = 10,207.94