Finding the Fourth Proportional to 1,431.98, 1,974.57 and 1,039.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.98 : 1,974.57 = 1,039.22 : x
2. Step 2: Convert to fraction form
   1,431.98/1,974.57 = 1,039.22/x
3. Step 3: Cross multiply
   1,431.98x = 1,974.57 × 1,039.22
4. Step 4: Simplify right side
   1,431.98x = 2,052,012.64
5. Step 5: Solve for x
   x = 2,052,012.64/1,431.98
6. Step 6: Final answer
   x = 1,432.99