Finding the Fourth Proportional to 13,630.78, 18,810.78 and 8,328.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,630.78 : 18,810.78 = 8,328.52 : x
2. Step 2: Convert to fraction form
   13,630.78/18,810.78 = 8,328.52/x
3. Step 3: Cross multiply
   13,630.78x = 18,810.78 × 8,328.52
4. Step 4: Simplify right side
   13,630.78x = 156,665,996.58
5. Step 5: Solve for x
   x = 156,665,996.58/13,630.78
6. Step 6: Final answer
   x = 11,493.54