Finding the Fourth Proportional to 21,978.73, 30,338.51 and 13,026.41

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.73 : 30,338.51 = 13,026.41 : x
2. Step 2: Convert to fraction form
   21,978.73/30,338.51 = 13,026.41/x
3. Step 3: Cross multiply
   21,978.73x = 30,338.51 × 13,026.41
4. Step 4: Simplify right side
   21,978.73x = 395,201,870.05
5. Step 5: Solve for x
   x = 395,201,870.05/21,978.73
6. Step 6: Final answer
   x = 17,981.11