Finding the Fourth Proportional to 1,289.30, 1,931.51 and 1,143.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,289.30 : 1,931.51 = 1,143.50 : x
2. Step 2: Convert to fraction form
   1,289.30/1,931.51 = 1,143.50/x
3. Step 3: Cross multiply
   1,289.30x = 1,931.51 × 1,143.50
4. Step 4: Simplify right side
   1,289.30x = 2,208,674.89
5. Step 5: Solve for x
   x = 2,208,674.89/1,289.30
6. Step 6: Final answer
   x = 1,713.09