Finding the Fourth Proportional to 21,821.58, 30,113.46 and 12,389.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,821.58 : 30,113.46 = 12,389.52 : x
2. Step 2: Convert to fraction form
   21,821.58/30,113.46 = 12,389.52/x
3. Step 3: Cross multiply
   21,821.58x = 30,113.46 × 12,389.52
4. Step 4: Simplify right side
   21,821.58x = 373,091,314.94
5. Step 5: Solve for x
   x = 373,091,314.94/21,821.58
6. Step 6: Final answer
   x = 17,097.36