Finding the Fourth Proportional to 10,878.42, 16,301.01 and 8,091.61

Step by Step Solution

1. Step 1: Write the proportion equation
   10,878.42 : 16,301.01 = 8,091.61 : x
2. Step 2: Convert to fraction form
   10,878.42/16,301.01 = 8,091.61/x
3. Step 3: Cross multiply
   10,878.42x = 16,301.01 × 8,091.61
4. Step 4: Simplify right side
   10,878.42x = 131,901,415.53
5. Step 5: Solve for x
   x = 131,901,415.53/10,878.42
6. Step 6: Final answer
   x = 12,125.06