Finding the Fourth Proportional to 1,003.48, 1,383.78 and 837.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.48 : 1,383.78 = 837.64 : x
2. Step 2: Convert to fraction form
   1,003.48/1,383.78 = 837.64/x
3. Step 3: Cross multiply
   1,003.48x = 1,383.78 × 837.64
4. Step 4: Simplify right side
   1,003.48x = 1,159,109.48
5. Step 5: Solve for x
   x = 1,159,109.48/1,003.48
6. Step 6: Final answer
   x = 1,155.09