Finding the Fourth Proportional to 1,091.69, 1,506.42 and 649.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.69 : 1,506.42 = 649.70 : x
2. Step 2: Convert to fraction form
   1,091.69/1,506.42 = 649.70/x
3. Step 3: Cross multiply
   1,091.69x = 1,506.42 × 649.70
4. Step 4: Simplify right side
   1,091.69x = 978,713.54
5. Step 5: Solve for x
   x = 978,713.54/1,091.69
6. Step 6: Final answer
   x = 896.52