Finding the Fourth Proportional to 21,683.72, 29,928.48 and 13,736.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,683.72 : 29,928.48 = 13,736.82 : x
2. Step 2: Convert to fraction form
   21,683.72/29,928.48 = 13,736.82/x
3. Step 3: Cross multiply
   21,683.72x = 29,928.48 × 13,736.82
4. Step 4: Simplify right side
   21,683.72x = 411,122,142.63
5. Step 5: Solve for x
   x = 411,122,142.63/21,683.72
6. Step 6: Final answer
   x = 18,959.95