Finding the Fourth Proportional to 1,145.36, 1,719.46 and 1,140.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.36 : 1,719.46 = 1,140.09 : x
2. Step 2: Convert to fraction form
   1,145.36/1,719.46 = 1,140.09/x
3. Step 3: Cross multiply
   1,145.36x = 1,719.46 × 1,140.09
4. Step 4: Simplify right side
   1,145.36x = 1,960,339.15
5. Step 5: Solve for x
   x = 1,960,339.15/1,145.36
6. Step 6: Final answer
   x = 1,711.55