Finding the Fourth Proportional to 21,756, 30,023.28 and 12,924

Step by Step Solution

1. Step 1: Write the proportion equation
   21,756 : 30,023.28 = 12,924 : x
2. Step 2: Convert to fraction form
   21,756/30,023.28 = 12,924/x
3. Step 3: Cross multiply
   21,756x = 30,023.28 × 12,924
4. Step 4: Simplify right side
   21,756x = 388,020,870.72
5. Step 5: Solve for x
   x = 388,020,870.72/21,756
6. Step 6: Final answer
   x = 17,835.12