Finding the Fourth Proportional to 21,948, 30,288.72 and 12,012

Step by Step Solution

1. Step 1: Write the proportion equation
   21,948 : 30,288.72 = 12,012 : x
2. Step 2: Convert to fraction form
   21,948/30,288.72 = 12,012/x
3. Step 3: Cross multiply
   21,948x = 30,288.72 × 12,012
4. Step 4: Simplify right side
   21,948x = 363,828,104.64
5. Step 5: Solve for x
   x = 363,828,104.64/21,948
6. Step 6: Final answer
   x = 16,576.82