Finding the Fourth Proportional to 21,820.48, 30,112.30 and 12,389.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,820.48 : 30,112.30 = 12,389.04 : x
2. Step 2: Convert to fraction form
   21,820.48/30,112.30 = 12,389.04/x
3. Step 3: Cross multiply
   21,820.48x = 30,112.30 × 12,389.04
4. Step 4: Simplify right side
   21,820.48x = 373,062,554.52
5. Step 5: Solve for x
   x = 373,062,554.52/21,820.48
6. Step 6: Final answer
   x = 17,096.90