Finding the Fourth Proportional to 2,828.01, 3,894.42 and 2,647.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,828.01 : 3,894.42 = 2,647.50 : x
2. Step 2: Convert to fraction form
   2,828.01/3,894.42 = 2,647.50/x
3. Step 3: Cross multiply
   2,828.01x = 3,894.42 × 2,647.50
4. Step 4: Simplify right side
   2,828.01x = 10,310,476.95
5. Step 5: Solve for x
   x = 10,310,476.95/2,828.01
6. Step 6: Final answer
   x = 3,645.84