Finding the Fourth Proportional to 3,951.78, 5,926.34 and 1,318.70

Step by Step Solution

1. Step 1: Write the proportion equation
   3,951.78 : 5,926.34 = 1,318.70 : x
2. Step 2: Convert to fraction form
   3,951.78/5,926.34 = 1,318.70/x
3. Step 3: Cross multiply
   3,951.78x = 5,926.34 × 1,318.70
4. Step 4: Simplify right side
   3,951.78x = 7,815,064.56
5. Step 5: Solve for x
   x = 7,815,064.56/3,951.78
6. Step 6: Final answer
   x = 1,977.61