Finding the Fourth Proportional to 21,751.20, 30,016.63 and 12,321.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,751.20 : 30,016.63 = 12,321.58 : x
2. Step 2: Convert to fraction form
   21,751.20/30,016.63 = 12,321.58/x
3. Step 3: Cross multiply
   21,751.20x = 30,016.63 × 12,321.58
4. Step 4: Simplify right side
   21,751.20x = 369,852,307.88
5. Step 5: Solve for x
   x = 369,852,307.88/21,751.20
6. Step 6: Final answer
   x = 17,003.77