Finding the Fourth Proportional to 21,805.81, 30,084.15 and 12,368.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,805.81 : 30,084.15 = 12,368.91 : x
2. Step 2: Convert to fraction form
   21,805.81/30,084.15 = 12,368.91/x
3. Step 3: Cross multiply
   21,805.81x = 30,084.15 × 12,368.91
4. Step 4: Simplify right side
   21,805.81x = 372,108,143.78
5. Step 5: Solve for x
   x = 372,108,143.78/21,805.81
6. Step 6: Final answer
   x = 17,064.63