Finding the Fourth Proportional to 19,860.21, 27,406.89 and 10,907.82

Step by Step Solution

1. Step 1: Write the proportion equation
   19,860.21 : 27,406.89 = 10,907.82 : x
2. Step 2: Convert to fraction form
   19,860.21/27,406.89 = 10,907.82/x
3. Step 3: Cross multiply
   19,860.21x = 27,406.89 × 10,907.82
4. Step 4: Simplify right side
   19,860.21x = 298,949,422.88
5. Step 5: Solve for x
   x = 298,949,422.88/19,860.21
6. Step 6: Final answer
   x = 15,052.68