Finding the Fourth Proportional to 1,091.30, 1,505.79 and 649.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.30 : 1,505.79 = 649.31 : x
2. Step 2: Convert to fraction form
   1,091.30/1,505.79 = 649.31/x
3. Step 3: Cross multiply
   1,091.30x = 1,505.79 × 649.31
4. Step 4: Simplify right side
   1,091.30x = 977,724.50
5. Step 5: Solve for x
   x = 977,724.50/1,091.30
6. Step 6: Final answer
   x = 895.93