Finding the Fourth Proportional to 1,931.28, 2,665.19 and 1,047.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.28 : 2,665.19 = 1,047.09 : x
2. Step 2: Convert to fraction form
   1,931.28/2,665.19 = 1,047.09/x
3. Step 3: Cross multiply
   1,931.28x = 2,665.19 × 1,047.09
4. Step 4: Simplify right side
   1,931.28x = 2,790,688.56
5. Step 5: Solve for x
   x = 2,790,688.56/1,931.28
6. Step 6: Final answer
   x = 1,444.99