Finding the Fourth Proportional to 5,250.80, 7,870.32 and 2,648.27

Step by Step Solution

1. Step 1: Write the proportion equation
   5,250.80 : 7,870.32 = 2,648.27 : x
2. Step 2: Convert to fraction form
   5,250.80/7,870.32 = 2,648.27/x
3. Step 3: Cross multiply
   5,250.80x = 7,870.32 × 2,648.27
4. Step 4: Simplify right side
   5,250.80x = 20,842,692.99
5. Step 5: Solve for x
   x = 20,842,692.99/5,250.80
6. Step 6: Final answer
   x = 3,969.44