Finding the Fourth Proportional to 8,139.15, 12,208.71 and 2,592.81

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.15 : 12,208.71 = 2,592.81 : x
2. Step 2: Convert to fraction form
   8,139.15/12,208.71 = 2,592.81/x
3. Step 3: Cross multiply
   8,139.15x = 12,208.71 × 2,592.81
4. Step 4: Simplify right side
   8,139.15x = 31,654,865.38
5. Step 5: Solve for x
   x = 31,654,865.38/8,139.15
6. Step 6: Final answer
   x = 3,889.21