Finding the Fourth Proportional to 22,388.87, 30,896.89 and 12,828.56

Step by Step Solution

1. Step 1: Write the proportion equation
   22,388.87 : 30,896.89 = 12,828.56 : x
2. Step 2: Convert to fraction form
   22,388.87/30,896.89 = 12,828.56/x
3. Step 3: Cross multiply
   22,388.87x = 30,896.89 × 12,828.56
4. Step 4: Simplify right side
   22,388.87x = 396,362,700.46
5. Step 5: Solve for x
   x = 396,362,700.46/22,388.87
6. Step 6: Final answer
   x = 17,703.56