Finding the Fourth Proportional to 13,222.42, 18,245.98 and 7,915.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,222.42 : 18,245.98 = 7,915.30 : x
2. Step 2: Convert to fraction form
   13,222.42/18,245.98 = 7,915.30/x
3. Step 3: Cross multiply
   13,222.42x = 18,245.98 × 7,915.30
4. Step 4: Simplify right side
   13,222.42x = 144,422,405.49
5. Step 5: Solve for x
   x = 144,422,405.49/13,222.42
6. Step 6: Final answer
   x = 10,922.54