Finding the Fourth Proportional to 12,992.25, 19,519.58 and 8,321.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,992.25 : 19,519.58 = 8,321.31 : x
2. Step 2: Convert to fraction form
   12,992.25/19,519.58 = 8,321.31/x
3. Step 3: Cross multiply
   12,992.25x = 19,519.58 × 8,321.31
4. Step 4: Simplify right side
   12,992.25x = 162,428,434.64
5. Step 5: Solve for x
   x = 162,428,434.64/12,992.25
6. Step 6: Final answer
   x = 12,501.95