Finding the Fourth Proportional to 1,931.34, 2,665.17 and 1,145.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.34 : 2,665.17 = 1,145.40 : x
2. Step 2: Convert to fraction form
   1,931.34/2,665.17 = 1,145.40/x
3. Step 3: Cross multiply
   1,931.34x = 2,665.17 × 1,145.40
4. Step 4: Simplify right side
   1,931.34x = 3,052,685.72
5. Step 5: Solve for x
   x = 3,052,685.72/1,931.34
6. Step 6: Final answer
   x = 1,580.61