Finding the Fourth Proportional to 3,145.25, 4,718.55 and 1,065.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,145.25 : 4,718.55 = 1,065.31 : x
2. Step 2: Convert to fraction form
   3,145.25/4,718.55 = 1,065.31/x
3. Step 3: Cross multiply
   3,145.25x = 4,718.55 × 1,065.31
4. Step 4: Simplify right side
   3,145.25x = 5,026,718.50
5. Step 5: Solve for x
   x = 5,026,718.50/3,145.25
6. Step 6: Final answer
   x = 1,598.19