Finding the Fourth Proportional to 1,003.54, 1,505.31 and 659.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.54 : 1,505.31 = 659.06 : x
2. Step 2: Convert to fraction form
   1,003.54/1,505.31 = 659.06/x
3. Step 3: Cross multiply
   1,003.54x = 1,505.31 × 659.06
4. Step 4: Simplify right side
   1,003.54x = 992,082.08
5. Step 5: Solve for x
   x = 992,082.08/1,003.54
6. Step 6: Final answer
   x = 988.58