Finding the Fourth Proportional to 21,835.62, 30,131.76 and 12,883.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,835.62 : 30,131.76 = 12,883.50 : x
2. Step 2: Convert to fraction form
   21,835.62/30,131.76 = 12,883.50/x
3. Step 3: Cross multiply
   21,835.62x = 30,131.76 × 12,883.50
4. Step 4: Simplify right side
   21,835.62x = 388,202,529.96
5. Step 5: Solve for x
   x = 388,202,529.96/21,835.62
6. Step 6: Final answer
   x = 17,778.41