Finding the Fourth Proportional to 1,931.80, 2,665.96 and 1,145.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.80 : 2,665.96 = 1,145.68 : x
2. Step 2: Convert to fraction form
   1,931.80/2,665.96 = 1,145.68/x
3. Step 3: Cross multiply
   1,931.80x = 2,665.96 × 1,145.68
4. Step 4: Simplify right side
   1,931.80x = 3,054,337.05
5. Step 5: Solve for x
   x = 3,054,337.05/1,931.80
6. Step 6: Final answer
   x = 1,581.08