Finding the Fourth Proportional to 6,871.61, 10,302.73 and 3,171.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,871.61 : 10,302.73 = 3,171.78 : x
2. Step 2: Convert to fraction form
   6,871.61/10,302.73 = 3,171.78/x
3. Step 3: Cross multiply
   6,871.61x = 10,302.73 × 3,171.78
4. Step 4: Simplify right side
   6,871.61x = 32,677,985.03
5. Step 5: Solve for x
   x = 32,677,985.03/6,871.61
6. Step 6: Final answer
   x = 4,755.50