Finding the Fourth Proportional to 2,889.72, 3,985.92 and 2,005.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,889.72 : 3,985.92 = 2,005.98 : x
2. Step 2: Convert to fraction form
   2,889.72/3,985.92 = 2,005.98/x
3. Step 3: Cross multiply
   2,889.72x = 3,985.92 × 2,005.98
4. Step 4: Simplify right side
   2,889.72x = 7,995,675.80
5. Step 5: Solve for x
   x = 7,995,675.80/2,889.72
6. Step 6: Final answer
   x = 2,766.94