Finding the Fourth Proportional to 13,222.47, 19,836.34 and 4,459.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,222.47 : 19,836.34 = 4,459.89 : x
2. Step 2: Convert to fraction form
   13,222.47/19,836.34 = 4,459.89/x
3. Step 3: Cross multiply
   13,222.47x = 19,836.34 × 4,459.89
4. Step 4: Simplify right side
   13,222.47x = 88,467,894.40
5. Step 5: Solve for x
   x = 88,467,894.40/13,222.47
6. Step 6: Final answer
   x = 6,690.72