Finding the Fourth Proportional to 13,205.78, 18,223.89 and 7,237.35

Step by Step Solution

1. Step 1: Write the proportion equation
   13,205.78 : 18,223.89 = 7,237.35 : x
2. Step 2: Convert to fraction form
   13,205.78/18,223.89 = 7,237.35/x
3. Step 3: Cross multiply
   13,205.78x = 18,223.89 × 7,237.35
4. Step 4: Simplify right side
   13,205.78x = 131,892,643.15
5. Step 5: Solve for x
   x = 131,892,643.15/13,205.78
6. Step 6: Final answer
   x = 9,987.49