Finding the Fourth Proportional to 13,196.91, 18,209.57 and 7,531.67

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.91 : 18,209.57 = 7,531.67 : x
2. Step 2: Convert to fraction form
   13,196.91/18,209.57 = 7,531.67/x
3. Step 3: Cross multiply
   13,196.91x = 18,209.57 × 7,531.67
4. Step 4: Simplify right side
   13,196.91x = 137,148,479.95
5. Step 5: Solve for x
   x = 137,148,479.95/13,196.91
6. Step 6: Final answer
   x = 10,392.47