Finding the Fourth Proportional to 13,196.74, 18,211.51 and 7,228.51

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.74 : 18,211.51 = 7,228.51 : x
2. Step 2: Convert to fraction form
   13,196.74/18,211.51 = 7,228.51/x
3. Step 3: Cross multiply
   13,196.74x = 18,211.51 × 7,228.51
4. Step 4: Simplify right side
   13,196.74x = 131,642,018.55
5. Step 5: Solve for x
   x = 131,642,018.55/13,196.74
6. Step 6: Final answer
   x = 9,975.34