Finding the Fourth Proportional to 1,931.25, 2,665.13 and 1,145.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.25 : 2,665.13 = 1,145.35 : x
2. Step 2: Convert to fraction form
   1,931.25/2,665.13 = 1,145.35/x
3. Step 3: Cross multiply
   1,931.25x = 2,665.13 × 1,145.35
4. Step 4: Simplify right side
   1,931.25x = 3,052,506.65
5. Step 5: Solve for x
   x = 3,052,506.65/1,931.25
6. Step 6: Final answer
   x = 1,580.59