Finding the Fourth Proportional to 1,443.34, 1,992.90 and 912.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.34 : 1,992.90 = 912.39 : x
2. Step 2: Convert to fraction form
   1,443.34/1,992.90 = 912.39/x
3. Step 3: Cross multiply
   1,443.34x = 1,992.90 × 912.39
4. Step 4: Simplify right side
   1,443.34x = 1,818,302.03
5. Step 5: Solve for x
   x = 1,818,302.03/1,443.34
6. Step 6: Final answer
   x = 1,259.79