Finding the Fourth Proportional to 1,175.72, 1,618.81 and 998.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,175.72 : 1,618.81 = 998.31 : x
2. Step 2: Convert to fraction form
   1,175.72/1,618.81 = 998.31/x
3. Step 3: Cross multiply
   1,175.72x = 1,618.81 × 998.31
4. Step 4: Simplify right side
   1,175.72x = 1,616,069.22
5. Step 5: Solve for x
   x = 1,616,069.22/1,175.72
6. Step 6: Final answer
   x = 1,374.54