Finding the Fourth Proportional to 3,851.98, 5,315.42 and 2,173.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,851.98 : 5,315.42 = 2,173.82 : x
2. Step 2: Convert to fraction form
   3,851.98/5,315.42 = 2,173.82/x
3. Step 3: Cross multiply
   3,851.98x = 5,315.42 × 2,173.82
4. Step 4: Simplify right side
   3,851.98x = 11,554,766.30
5. Step 5: Solve for x
   x = 11,554,766.30/3,851.98
6. Step 6: Final answer
   x = 2,999.70