Finding the Fourth Proportional to 1,441.87, 1,988.76 and 999.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.87 : 1,988.76 = 999.91 : x
2. Step 2: Convert to fraction form
   1,441.87/1,988.76 = 999.91/x
3. Step 3: Cross multiply
   1,441.87x = 1,988.76 × 999.91
4. Step 4: Simplify right side
   1,441.87x = 1,988,581.01
5. Step 5: Solve for x
   x = 1,988,581.01/1,441.87
6. Step 6: Final answer
   x = 1,379.17