Finding the Fourth Proportional to 8,139.89, 12,209.05 and 2,592.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.89 : 12,209.05 = 2,592.25 : x
2. Step 2: Convert to fraction form
   8,139.89/12,209.05 = 2,592.25/x
3. Step 3: Cross multiply
   8,139.89x = 12,209.05 × 2,592.25
4. Step 4: Simplify right side
   8,139.89x = 31,648,958.55
5. Step 5: Solve for x
   x = 31,648,958.55/8,139.89
6. Step 6: Final answer
   x = 3,888.13