Finding the Fourth Proportional to 13,917.77, 20,870.17 and 8,076.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,917.77 : 20,870.17 = 8,076.05 : x
2. Step 2: Convert to fraction form
   13,917.77/20,870.17 = 8,076.05/x
3. Step 3: Cross multiply
   13,917.77x = 20,870.17 × 8,076.05
4. Step 4: Simplify right side
   13,917.77x = 168,548,411.89
5. Step 5: Solve for x
   x = 168,548,411.89/13,917.77
6. Step 6: Final answer
   x = 12,110.31