Finding the Fourth Proportional to 21,300.21, 29,406.05 and 12,804.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.21 : 29,406.05 = 12,804.38 : x
2. Step 2: Convert to fraction form
   21,300.21/29,406.05 = 12,804.38/x
3. Step 3: Cross multiply
   21,300.21x = 29,406.05 × 12,804.38
4. Step 4: Simplify right side
   21,300.21x = 376,526,185.74
5. Step 5: Solve for x
   x = 376,526,185.74/21,300.21
6. Step 6: Final answer
   x = 17,677.11