Finding the Fourth Proportional to 21,919.38, 30,248.69 and 12,488.01

Step by Step Solution

1. Step 1: Write the proportion equation
   21,919.38 : 30,248.69 = 12,488.01 : x
2. Step 2: Convert to fraction form
   21,919.38/30,248.69 = 12,488.01/x
3. Step 3: Cross multiply
   21,919.38x = 30,248.69 × 12,488.01
4. Step 4: Simplify right side
   21,919.38x = 377,745,880.77
5. Step 5: Solve for x
   x = 377,745,880.77/21,919.38
6. Step 6: Final answer
   x = 17,233.42