Finding the Fourth Proportional to 3,912.78, 5,865.12 and 1,314.84

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912.78 : 5,865.12 = 1,314.84 : x
2. Step 2: Convert to fraction form
   3,912.78/5,865.12 = 1,314.84/x
3. Step 3: Cross multiply
   3,912.78x = 5,865.12 × 1,314.84
4. Step 4: Simplify right side
   3,912.78x = 7,711,694.38
5. Step 5: Solve for x
   x = 7,711,694.38/3,912.78
6. Step 6: Final answer
   x = 1,970.90