Finding the Fourth Proportional to 1,090.82, 1,505.25 and 648.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.82 : 1,505.25 = 648.77 : x
2. Step 2: Convert to fraction form
   1,090.82/1,505.25 = 648.77/x
3. Step 3: Cross multiply
   1,090.82x = 1,505.25 × 648.77
4. Step 4: Simplify right side
   1,090.82x = 976,553.52
5. Step 5: Solve for x
   x = 976,553.52/1,090.82
6. Step 6: Final answer
   x = 895.25