Finding the Fourth Proportional to 19,890.56, 27,449.17 and 10,938.12

Step by Step Solution

1. Step 1: Write the proportion equation
   19,890.56 : 27,449.17 = 10,938.12 : x
2. Step 2: Convert to fraction form
   19,890.56/27,449.17 = 10,938.12/x
3. Step 3: Cross multiply
   19,890.56x = 27,449.17 × 10,938.12
4. Step 4: Simplify right side
   19,890.56x = 300,242,288.02
5. Step 5: Solve for x
   x = 300,242,288.02/19,890.56
6. Step 6: Final answer
   x = 15,094.72