Finding the Fourth Proportional to 21,821.41, 30,113.59 and 12,389.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,821.41 : 30,113.59 = 12,389.98 : x
2. Step 2: Convert to fraction form
   21,821.41/30,113.59 = 12,389.98/x
3. Step 3: Cross multiply
   21,821.41x = 30,113.59 × 12,389.98
4. Step 4: Simplify right side
   21,821.41x = 373,106,565.31
5. Step 5: Solve for x
   x = 373,106,565.31/21,821.41
6. Step 6: Final answer
   x = 17,098.19