Finding the Fourth Proportional to 21,821.06, 30,112.78 and 12,389.01

Step by Step Solution

1. Step 1: Write the proportion equation
   21,821.06 : 30,112.78 = 12,389.01 : x
2. Step 2: Convert to fraction form
   21,821.06/30,112.78 = 12,389.01/x
3. Step 3: Cross multiply
   21,821.06x = 30,112.78 × 12,389.01
4. Step 4: Simplify right side
   21,821.06x = 373,067,532.55
5. Step 5: Solve for x
   x = 373,067,532.55/21,821.06
6. Step 6: Final answer
   x = 17,096.68