Finding the Fourth Proportional to 19,890.72, 27,449.39 and 10,938.29

Step by Step Solution

1. Step 1: Write the proportion equation
   19,890.72 : 27,449.39 = 10,938.29 : x
2. Step 2: Convert to fraction form
   19,890.72/27,449.39 = 10,938.29/x
3. Step 3: Cross multiply
   19,890.72x = 27,449.39 × 10,938.29
4. Step 4: Simplify right side
   19,890.72x = 300,249,196.20
5. Step 5: Solve for x
   x = 300,249,196.20/19,890.72
6. Step 6: Final answer
   x = 15,094.94