Finding the Fourth Proportional to 19,872.81, 27,424.17 and 10,920.15

Step by Step Solution

1. Step 1: Write the proportion equation
   19,872.81 : 27,424.17 = 10,920.15 : x
2. Step 2: Convert to fraction form
   19,872.81/27,424.17 = 10,920.15/x
3. Step 3: Cross multiply
   19,872.81x = 27,424.17 × 10,920.15
4. Step 4: Simplify right side
   19,872.81x = 299,476,050.03
5. Step 5: Solve for x
   x = 299,476,050.03/19,872.81
6. Step 6: Final answer
   x = 15,069.64