Finding the Fourth Proportional to 1,983.89, 2,972.43 and 1,289.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,983.89 : 2,972.43 = 1,289.72 : x
2. Step 2: Convert to fraction form
   1,983.89/2,972.43 = 1,289.72/x
3. Step 3: Cross multiply
   1,983.89x = 2,972.43 × 1,289.72
4. Step 4: Simplify right side
   1,983.89x = 3,833,609.85
5. Step 5: Solve for x
   x = 3,833,609.85/1,983.89
6. Step 6: Final answer
   x = 1,932.37