Finding the Fourth Proportional to 5,383.82, 7,427.56 and 3,970.90

Step by Step Solution

1. Step 1: Write the proportion equation
   5,383.82 : 7,427.56 = 3,970.90 : x
2. Step 2: Convert to fraction form
   5,383.82/7,427.56 = 3,970.90/x
3. Step 3: Cross multiply
   5,383.82x = 7,427.56 × 3,970.90
4. Step 4: Simplify right side
   5,383.82x = 29,494,041.01
5. Step 5: Solve for x
   x = 29,494,041.01/5,383.82
6. Step 6: Final answer
   x = 5,478.28