Finding the Fourth Proportional to 5,393.96, 7,443.16 and 3,978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   5,393.96 : 7,443.16 = 3,978.42 : x
2. Step 2: Convert to fraction form
   5,393.96/7,443.16 = 3,978.42/x
3. Step 3: Cross multiply
   5,393.96x = 7,443.16 × 3,978.42
4. Step 4: Simplify right side
   5,393.96x = 29,611,996.72
5. Step 5: Solve for x
   x = 29,611,996.72/5,393.96
6. Step 6: Final answer
   x = 5,489.84