Finding the Fourth Proportional to 13,760.54, 18,994.39 and 8,171.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,760.54 : 18,994.39 = 8,171.50 : x
2. Step 2: Convert to fraction form
   13,760.54/18,994.39 = 8,171.50/x
3. Step 3: Cross multiply
   13,760.54x = 18,994.39 × 8,171.50
4. Step 4: Simplify right side
   13,760.54x = 155,212,657.89
5. Step 5: Solve for x
   x = 155,212,657.89/13,760.54
6. Step 6: Final answer
   x = 11,279.55