Finding the Fourth Proportional to 8,091.05, 12,139.47 and 3,164.22

Step by Step Solution

1. Step 1: Write the proportion equation
   8,091.05 : 12,139.47 = 3,164.22 : x
2. Step 2: Convert to fraction form
   8,091.05/12,139.47 = 3,164.22/x
3. Step 3: Cross multiply
   8,091.05x = 12,139.47 × 3,164.22
4. Step 4: Simplify right side
   8,091.05x = 38,411,953.76
5. Step 5: Solve for x
   x = 38,411,953.76/8,091.05
6. Step 6: Final answer
   x = 4,747.47