Finding the Fourth Proportional to 21,362.48, 29,479.31 and 12,287.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,362.48 : 29,479.31 = 12,287.15 : x
2. Step 2: Convert to fraction form
   21,362.48/29,479.31 = 12,287.15/x
3. Step 3: Cross multiply
   21,362.48x = 29,479.31 × 12,287.15
4. Step 4: Simplify right side
   21,362.48x = 362,216,587.19
5. Step 5: Solve for x
   x = 362,216,587.19/21,362.48
6. Step 6: Final answer
   x = 16,955.74