Finding the Fourth Proportional to 5,178.42, 7,145.67 and 2,940.48

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178.42 : 7,145.67 = 2,940.48 : x
2. Step 2: Convert to fraction form
   5,178.42/7,145.67 = 2,940.48/x
3. Step 3: Cross multiply
   5,178.42x = 7,145.67 × 2,940.48
4. Step 4: Simplify right side
   5,178.42x = 21,011,699.72
5. Step 5: Solve for x
   x = 21,011,699.72/5,178.42
6. Step 6: Final answer
   x = 4,057.55