Finding the Fourth Proportional to 13,196.32, 18,210.89 and 7,228.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.32 : 18,210.89 = 7,228.10 : x
2. Step 2: Convert to fraction form
   13,196.32/18,210.89 = 7,228.10/x
3. Step 3: Cross multiply
   13,196.32x = 18,210.89 × 7,228.10
4. Step 4: Simplify right side
   13,196.32x = 131,630,197.61
5. Step 5: Solve for x
   x = 131,630,197.61/13,196.32
6. Step 6: Final answer
   x = 9,974.77