Finding the Fourth Proportional to 21,814.65, 30,100.59 and 12,860.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,814.65 : 30,100.59 = 12,860.91 : x
2. Step 2: Convert to fraction form
   21,814.65/30,100.59 = 12,860.91/x
3. Step 3: Cross multiply
   21,814.65x = 30,100.59 × 12,860.91
4. Step 4: Simplify right side
   21,814.65x = 387,120,978.94
5. Step 5: Solve for x
   x = 387,120,978.94/21,814.65
6. Step 6: Final answer
   x = 17,745.92