Finding the Fourth Proportional to 1,441.57, 1,988.55 and 998.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.57 : 1,988.55 = 998.70 : x
2. Step 2: Convert to fraction form
   1,441.57/1,988.55 = 998.70/x
3. Step 3: Cross multiply
   1,441.57x = 1,988.55 × 998.70
4. Step 4: Simplify right side
   1,441.57x = 1,985,964.89
5. Step 5: Solve for x
   x = 1,985,964.89/1,441.57
6. Step 6: Final answer
   x = 1,377.64