Finding the Fourth Proportional to 3,912.88, 5,870.10 and 1,316.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912.88 : 5,870.10 = 1,316.56 : x
2. Step 2: Convert to fraction form
   3,912.88/5,870.10 = 1,316.56/x
3. Step 3: Cross multiply
   3,912.88x = 5,870.10 × 1,316.56
4. Step 4: Simplify right side
   3,912.88x = 7,728,338.86
5. Step 5: Solve for x
   x = 7,728,338.86/3,912.88
6. Step 6: Final answer
   x = 1,975.10