Finding the Fourth Proportional to 21,998.25, 30,357.72 and 12,572.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,998.25 : 30,357.72 = 12,572.28 : x
2. Step 2: Convert to fraction form
   21,998.25/30,357.72 = 12,572.28/x
3. Step 3: Cross multiply
   21,998.25x = 30,357.72 × 12,572.28
4. Step 4: Simplify right side
   21,998.25x = 381,665,756.00
5. Step 5: Solve for x
   x = 381,665,756.00/21,998.25
6. Step 6: Final answer
   x = 17,349.82