Finding the Fourth Proportional to 1,009.09, 1,392.56 and 659.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.09 : 1,392.56 = 659.57 : x
2. Step 2: Convert to fraction form
   1,009.09/1,392.56 = 659.57/x
3. Step 3: Cross multiply
   1,009.09x = 1,392.56 × 659.57
4. Step 4: Simplify right side
   1,009.09x = 918,490.80
5. Step 5: Solve for x
   x = 918,490.80/1,009.09
6. Step 6: Final answer
   x = 910.22