Finding the Fourth Proportional to 1,445.72, 1,995.68 and 998.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.72 : 1,995.68 = 998.20 : x
2. Step 2: Convert to fraction form
   1,445.72/1,995.68 = 998.20/x
3. Step 3: Cross multiply
   1,445.72x = 1,995.68 × 998.20
4. Step 4: Simplify right side
   1,445.72x = 1,992,087.78
5. Step 5: Solve for x
   x = 1,992,087.78/1,445.72
6. Step 6: Final answer
   x = 1,377.92