Finding the Fourth Proportional to 21,800.24, 30,085.31 and 12,848.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,800.24 : 30,085.31 = 12,848.12 : x
2. Step 2: Convert to fraction form
   21,800.24/30,085.31 = 12,848.12/x
3. Step 3: Cross multiply
   21,800.24x = 30,085.31 × 12,848.12
4. Step 4: Simplify right side
   21,800.24x = 386,539,673.12
5. Step 5: Solve for x
   x = 386,539,673.12/21,800.24
6. Step 6: Final answer
   x = 17,730.98