Finding the Fourth Proportional to 13,290.78, 18,339.68 and 7,625.22

Step by Step Solution

1. Step 1: Write the proportion equation
   13,290.78 : 18,339.68 = 7,625.22 : x
2. Step 2: Convert to fraction form
   13,290.78/18,339.68 = 7,625.22/x
3. Step 3: Cross multiply
   13,290.78x = 18,339.68 × 7,625.22
4. Step 4: Simplify right side
   13,290.78x = 139,844,094.73
5. Step 5: Solve for x
   x = 139,844,094.73/13,290.78
6. Step 6: Final answer
   x = 10,521.89