Finding the Fourth Proportional to 13,072.42, 18,039.85 and 7,484.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,072.42 : 18,039.85 = 7,484.50 : x
2. Step 2: Convert to fraction form
   13,072.42/18,039.85 = 7,484.50/x
3. Step 3: Cross multiply
   13,072.42x = 18,039.85 × 7,484.50
4. Step 4: Simplify right side
   13,072.42x = 135,019,257.33
5. Step 5: Solve for x
   x = 135,019,257.33/13,072.42
6. Step 6: Final answer
   x = 10,328.56