Finding the Fourth Proportional to 21,973.32, 30,317.94 and 13,019.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,973.32 : 30,317.94 = 13,019.28 : x
2. Step 2: Convert to fraction form
   21,973.32/30,317.94 = 13,019.28/x
3. Step 3: Cross multiply
   21,973.32x = 30,317.94 × 13,019.28
4. Step 4: Simplify right side
   21,973.32x = 394,717,684.79
5. Step 5: Solve for x
   x = 394,717,684.79/21,973.32
6. Step 6: Final answer
   x = 17,963.50