Finding the Fourth Proportional to 5,223.40, 7,827.98 and 2,628.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,223.40 : 7,827.98 = 2,628.12 : x
2. Step 2: Convert to fraction form
   5,223.40/7,827.98 = 2,628.12/x
3. Step 3: Cross multiply
   5,223.40x = 7,827.98 × 2,628.12
4. Step 4: Simplify right side
   5,223.40x = 20,572,870.80
5. Step 5: Solve for x
   x = 20,572,870.80/5,223.40
6. Step 6: Final answer
   x = 3,938.60