Finding the Fourth Proportional to 19,890.17, 27,447.50 and 10,938.05

Step by Step Solution

1. Step 1: Write the proportion equation
   19,890.17 : 27,447.50 = 10,938.05 : x
2. Step 2: Convert to fraction form
   19,890.17/27,447.50 = 10,938.05/x
3. Step 3: Cross multiply
   19,890.17x = 27,447.50 × 10,938.05
4. Step 4: Simplify right side
   19,890.17x = 300,222,072.68
5. Step 5: Solve for x
   x = 300,222,072.68/19,890.17
6. Step 6: Final answer
   x = 15,093.99