Finding the Fourth Proportional to 10,936.54, 16,385.91 and 8,611.39

Step by Step Solution

1. Step 1: Write the proportion equation
   10,936.54 : 16,385.91 = 8,611.39 : x
2. Step 2: Convert to fraction form
   10,936.54/16,385.91 = 8,611.39/x
3. Step 3: Cross multiply
   10,936.54x = 16,385.91 × 8,611.39
4. Step 4: Simplify right side
   10,936.54x = 141,105,461.51
5. Step 5: Solve for x
   x = 141,105,461.51/10,936.54
6. Step 6: Final answer
   x = 12,902.20