Finding the Fourth Proportional to 21,804.69, 30,090.42 and 12,243.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,804.69 : 30,090.42 = 12,243.18 : x
2. Step 2: Convert to fraction form
   21,804.69/30,090.42 = 12,243.18/x
3. Step 3: Cross multiply
   21,804.69x = 30,090.42 × 12,243.18
4. Step 4: Simplify right side
   21,804.69x = 368,402,428.34
5. Step 5: Solve for x
   x = 368,402,428.34/21,804.69
6. Step 6: Final answer
   x = 16,895.56