Finding the Fourth Proportional to 21,998.79, 30,355.56 and 12,567.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,998.79 : 30,355.56 = 12,567.96 : x
2. Step 2: Convert to fraction form
   21,998.79/30,355.56 = 12,567.96/x
3. Step 3: Cross multiply
   21,998.79x = 30,355.56 × 12,567.96
4. Step 4: Simplify right side
   21,998.79x = 381,507,463.86
5. Step 5: Solve for x
   x = 381,507,463.86/21,998.79
6. Step 6: Final answer
   x = 17,342.20