Finding the Fourth Proportional to 1,100.09, 1,517.78 and 657.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.09 : 1,517.78 = 657.89 : x
2. Step 2: Convert to fraction form
   1,100.09/1,517.78 = 657.89/x
3. Step 3: Cross multiply
   1,100.09x = 1,517.78 × 657.89
4. Step 4: Simplify right side
   1,100.09x = 998,532.28
5. Step 5: Solve for x
   x = 998,532.28/1,100.09
6. Step 6: Final answer
   x = 907.68