Finding the Fourth Proportional to 6,839.89, 10,256.25 and 3,138.91

Step by Step Solution

1. Step 1: Write the proportion equation
   6,839.89 : 10,256.25 = 3,138.91 : x
2. Step 2: Convert to fraction form
   6,839.89/10,256.25 = 3,138.91/x
3. Step 3: Cross multiply
   6,839.89x = 10,256.25 × 3,138.91
4. Step 4: Simplify right side
   6,839.89x = 32,193,445.69
5. Step 5: Solve for x
   x = 32,193,445.69/6,839.89
6. Step 6: Final answer
   x = 4,706.72