Finding the Fourth Proportional to 3,945.83, 5,919.08 and 1,312.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945.83 : 5,919.08 = 1,312.76 : x
2. Step 2: Convert to fraction form
   3,945.83/5,919.08 = 1,312.76/x
3. Step 3: Cross multiply
   3,945.83x = 5,919.08 × 1,312.76
4. Step 4: Simplify right side
   3,945.83x = 7,770,339.69
5. Step 5: Solve for x
   x = 7,770,339.69/3,945.83
6. Step 6: Final answer
   x = 1,969.26