Finding the Fourth Proportional to 21,518.82, 29,698.52 and 12,087.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,518.82 : 29,698.52 = 12,087.36 : x
2. Step 2: Convert to fraction form
   21,518.82/29,698.52 = 12,087.36/x
3. Step 3: Cross multiply
   21,518.82x = 29,698.52 × 12,087.36
4. Step 4: Simplify right side
   21,518.82x = 358,976,642.27
5. Step 5: Solve for x
   x = 358,976,642.27/21,518.82
6. Step 6: Final answer
   x = 16,681.99