Finding the Fourth Proportional to 13,086.90, 18,061.71 and 8,896.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.90 : 18,061.71 = 8,896.50 : x
2. Step 2: Convert to fraction form
   13,086.90/18,061.71 = 8,896.50/x
3. Step 3: Cross multiply
   13,086.90x = 18,061.71 × 8,896.50
4. Step 4: Simplify right side
   13,086.90x = 160,686,003.02
5. Step 5: Solve for x
   x = 160,686,003.02/13,086.90
6. Step 6: Final answer
   x = 12,278.39