Finding the Fourth Proportional to 21,823.14, 30,119.86 and 12,870.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,823.14 : 30,119.86 = 12,870.12 : x
2. Step 2: Convert to fraction form
   21,823.14/30,119.86 = 12,870.12/x
3. Step 3: Cross multiply
   21,823.14x = 30,119.86 × 12,870.12
4. Step 4: Simplify right side
   21,823.14x = 387,646,212.58
5. Step 5: Solve for x
   x = 387,646,212.58/21,823.14
6. Step 6: Final answer
   x = 17,763.08