Finding the Fourth Proportional to 5,298.42, 7,311.87 and 2,940.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,298.42 : 7,311.87 = 2,940.78 : x
2. Step 2: Convert to fraction form
   5,298.42/7,311.87 = 2,940.78/x
3. Step 3: Cross multiply
   5,298.42x = 7,311.87 × 2,940.78
4. Step 4: Simplify right side
   5,298.42x = 21,502,601.06
5. Step 5: Solve for x
   x = 21,502,601.06/5,298.42
6. Step 6: Final answer
   x = 4,058.30