Finding the Fourth Proportional to 21,823.32, 30,114.72 and 12,870.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,823.32 : 30,114.72 = 12,870.42 : x
2. Step 2: Convert to fraction form
   21,823.32/30,114.72 = 12,870.42/x
3. Step 3: Cross multiply
   21,823.32x = 30,114.72 × 12,870.42
4. Step 4: Simplify right side
   21,823.32x = 387,589,094.58
5. Step 5: Solve for x
   x = 387,589,094.58/21,823.32
6. Step 6: Final answer
   x = 17,760.32