Finding the Fourth Proportional to 21,848.82, 30,144.30 and 12,899.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,848.82 : 30,144.30 = 12,899.34 : x
2. Step 2: Convert to fraction form
   21,848.82/30,144.30 = 12,899.34/x
3. Step 3: Cross multiply
   21,848.82x = 30,144.30 × 12,899.34
4. Step 4: Simplify right side
   21,848.82x = 388,841,574.76
5. Step 5: Solve for x
   x = 388,841,574.76/21,848.82
6. Step 6: Final answer
   x = 17,796.91