Finding the Fourth Proportional to 13,200.76, 18,212.52 and 7,531.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,200.76 : 18,212.52 = 7,531.42 : x
2. Step 2: Convert to fraction form
   13,200.76/18,212.52 = 7,531.42/x
3. Step 3: Cross multiply
   13,200.76x = 18,212.52 × 7,531.42
4. Step 4: Simplify right side
   13,200.76x = 137,166,137.38
5. Step 5: Solve for x
   x = 137,166,137.38/13,200.76
6. Step 6: Final answer
   x = 10,390.78