Finding the Fourth Proportional to 21,801.81, 30,081.84 and 12,846.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,801.81 : 30,081.84 = 12,846.05 : x
2. Step 2: Convert to fraction form
   21,801.81/30,081.84 = 12,846.05/x
3. Step 3: Cross multiply
   21,801.81x = 30,081.84 × 12,846.05
4. Step 4: Simplify right side
   21,801.81x = 386,432,820.73
5. Step 5: Solve for x
   x = 386,432,820.73/21,801.81
6. Step 6: Final answer
   x = 17,724.80