Finding the Fourth Proportional to 1,554.12, 2,143.17 and 994.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.12 : 2,143.17 = 994.39 : x
2. Step 2: Convert to fraction form
   1,554.12/2,143.17 = 994.39/x
3. Step 3: Cross multiply
   1,554.12x = 2,143.17 × 994.39
4. Step 4: Simplify right side
   1,554.12x = 2,131,133.61
5. Step 5: Solve for x
   x = 2,131,133.61/1,554.12
6. Step 6: Final answer
   x = 1,371.28