Finding the Fourth Proportional to 1,003.86, 1,505.78 and 659.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.86 : 1,505.78 = 659.37 : x
2. Step 2: Convert to fraction form
   1,003.86/1,505.78 = 659.37/x
3. Step 3: Cross multiply
   1,003.86x = 1,505.78 × 659.37
4. Step 4: Simplify right side
   1,003.86x = 992,862.39
5. Step 5: Solve for x
   x = 992,862.39/1,003.86
6. Step 6: Final answer
   x = 989.05