Finding the Fourth Proportional to 21,973.83, 30,318.63 and 13,019.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,973.83 : 30,318.63 = 13,019.78 : x
2. Step 2: Convert to fraction form
   21,973.83/30,318.63 = 13,019.78/x
3. Step 3: Cross multiply
   21,973.83x = 30,318.63 × 13,019.78
4. Step 4: Simplify right side
   21,973.83x = 394,741,827.40
5. Step 5: Solve for x
   x = 394,741,827.40/21,973.83
6. Step 6: Final answer
   x = 17,964.18