Finding the Fourth Proportional to 13,222.68, 19,836.72 and 5,431.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,222.68 : 19,836.72 = 5,431.56 : x
2. Step 2: Convert to fraction form
   13,222.68/19,836.72 = 5,431.56/x
3. Step 3: Cross multiply
   13,222.68x = 19,836.72 × 5,431.56
4. Step 4: Simplify right side
   13,222.68x = 107,744,334.88
5. Step 5: Solve for x
   x = 107,744,334.88/13,222.68
6. Step 6: Final answer
   x = 8,148.45