Finding the Fourth Proportional to 21,978.09, 30,331.94 and 12,548.07

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.09 : 30,331.94 = 12,548.07 : x
2. Step 2: Convert to fraction form
   21,978.09/30,331.94 = 12,548.07/x
3. Step 3: Cross multiply
   21,978.09x = 30,331.94 × 12,548.07
4. Step 4: Simplify right side
   21,978.09x = 380,607,243.62
5. Step 5: Solve for x
   x = 380,607,243.62/21,978.09
6. Step 6: Final answer
   x = 17,317.58