Finding the Fourth Proportional to 6,872.61, 10,304.23 and 3,172.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,872.61 : 10,304.23 = 3,172.78 : x
2. Step 2: Convert to fraction form
   6,872.61/10,304.23 = 3,172.78/x
3. Step 3: Cross multiply
   6,872.61x = 10,304.23 × 3,172.78
4. Step 4: Simplify right side
   6,872.61x = 32,693,054.86
5. Step 5: Solve for x
   x = 32,693,054.86/6,872.61
6. Step 6: Final answer
   x = 4,757.01