Finding the Fourth Proportional to 21,819.75, 30,111.67 and 12,130.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,819.75 : 30,111.67 = 12,130.12 : x
2. Step 2: Convert to fraction form
   21,819.75/30,111.67 = 12,130.12/x
3. Step 3: Cross multiply
   21,819.75x = 30,111.67 × 12,130.12
4. Step 4: Simplify right side
   21,819.75x = 365,258,155.07
5. Step 5: Solve for x
   x = 365,258,155.07/21,819.75
6. Step 6: Final answer
   x = 16,739.79