Finding the Fourth Proportional to 13,518.73, 18,654.59 and 8,738.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,518.73 : 18,654.59 = 8,738.78 : x
2. Step 2: Convert to fraction form
   13,518.73/18,654.59 = 8,738.78/x
3. Step 3: Cross multiply
   13,518.73x = 18,654.59 × 8,738.78
4. Step 4: Simplify right side
   13,518.73x = 163,018,314.31
5. Step 5: Solve for x
   x = 163,018,314.31/13,518.73
6. Step 6: Final answer
   x = 12,058.70