Finding the Fourth Proportional to 5,665.12, 8,440.20 and 5,386.28

Step by Step Solution

1. Step 1: Write the proportion equation
   5,665.12 : 8,440.20 = 5,386.28 : x
2. Step 2: Convert to fraction form
   5,665.12/8,440.20 = 5,386.28/x
3. Step 3: Cross multiply
   5,665.12x = 8,440.20 × 5,386.28
4. Step 4: Simplify right side
   5,665.12x = 45,461,280.46
5. Step 5: Solve for x
   x = 45,461,280.46/5,665.12
6. Step 6: Final answer
   x = 8,024.77