Finding the Fourth Proportional to 1,090.67, 1,503.72 and 648.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.67 : 1,503.72 = 648.41 : x
2. Step 2: Convert to fraction form
   1,090.67/1,503.72 = 648.41/x
3. Step 3: Cross multiply
   1,090.67x = 1,503.72 × 648.41
4. Step 4: Simplify right side
   1,090.67x = 975,019.57
5. Step 5: Solve for x
   x = 975,019.57/1,090.67
6. Step 6: Final answer
   x = 893.97