Finding the Fourth Proportional to 21,238.35, 29,300.75 and 13,684.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,238.35 : 29,300.75 = 13,684.08 : x
2. Step 2: Convert to fraction form
   21,238.35/29,300.75 = 13,684.08/x
3. Step 3: Cross multiply
   21,238.35x = 29,300.75 × 13,684.08
4. Step 4: Simplify right side
   21,238.35x = 400,953,738.64
5. Step 5: Solve for x
   x = 400,953,738.64/21,238.35
6. Step 6: Final answer
   x = 18,878.76