Finding the Fourth Proportional to 12,986.06, 17,922.31 and 7,321.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986.06 : 17,922.31 = 7,321.88 : x
2. Step 2: Convert to fraction form
   12,986.06/17,922.31 = 7,321.88/x
3. Step 3: Cross multiply
   12,986.06x = 17,922.31 × 7,321.88
4. Step 4: Simplify right side
   12,986.06x = 131,225,029.64
5. Step 5: Solve for x
   x = 131,225,029.64/12,986.06
6. Step 6: Final answer
   x = 10,105.07