Finding the Fourth Proportional to 21,849.65, 30,151.62 and 12,900.03

Step by Step Solution

1. Step 1: Write the proportion equation
   21,849.65 : 30,151.62 = 12,900.03 : x
2. Step 2: Convert to fraction form
   21,849.65/30,151.62 = 12,900.03/x
3. Step 3: Cross multiply
   21,849.65x = 30,151.62 × 12,900.03
4. Step 4: Simplify right side
   21,849.65x = 388,956,907.60
5. Step 5: Solve for x
   x = 388,956,907.60/21,849.65
6. Step 6: Final answer
   x = 17,801.52