Finding the Fourth Proportional to 21,966.86, 30,308.99 and 13,016.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,966.86 : 30,308.99 = 13,016.57 : x
2. Step 2: Convert to fraction form
   21,966.86/30,308.99 = 13,016.57/x
3. Step 3: Cross multiply
   21,966.86x = 30,308.99 × 13,016.57
4. Step 4: Simplify right side
   21,966.86x = 394,518,873.34
5. Step 5: Solve for x
   x = 394,518,873.34/21,966.86
6. Step 6: Final answer
   x = 17,959.73