Finding the Fourth Proportional to 1,007.53, 1,399.69 and 998.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.53 : 1,399.69 = 998.52 : x
2. Step 2: Convert to fraction form
   1,007.53/1,399.69 = 998.52/x
3. Step 3: Cross multiply
   1,007.53x = 1,399.69 × 998.52
4. Step 4: Simplify right side
   1,007.53x = 1,397,618.46
5. Step 5: Solve for x
   x = 1,397,618.46/1,007.53
6. Step 6: Final answer
   x = 1,387.17