Finding the Fourth Proportional to 2,658.80, 3,971.98 and 2,645.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658.80 : 3,971.98 = 2,645.84 : x
2. Step 2: Convert to fraction form
   2,658.80/3,971.98 = 2,645.84/x
3. Step 3: Cross multiply
   2,658.80x = 3,971.98 × 2,645.84
4. Step 4: Simplify right side
   2,658.80x = 10,509,223.56
5. Step 5: Solve for x
   x = 10,509,223.56/2,658.80
6. Step 6: Final answer
   x = 3,952.62