Finding the Fourth Proportional to 21,791.62, 30,071.55 and 12,359.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,791.62 : 30,071.55 = 12,359.98 : x
2. Step 2: Convert to fraction form
   21,791.62/30,071.55 = 12,359.98/x
3. Step 3: Cross multiply
   21,791.62x = 30,071.55 × 12,359.98
4. Step 4: Simplify right side
   21,791.62x = 371,683,756.57
5. Step 5: Solve for x
   x = 371,683,756.57/21,791.62
6. Step 6: Final answer
   x = 17,056.27