Finding the Fourth Proportional to 1,003.40, 1,381.83 and 816.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.40 : 1,381.83 = 816.56 : x
2. Step 2: Convert to fraction form
   1,003.40/1,381.83 = 816.56/x
3. Step 3: Cross multiply
   1,003.40x = 1,381.83 × 816.56
4. Step 4: Simplify right side
   1,003.40x = 1,128,347.10
5. Step 5: Solve for x
   x = 1,128,347.10/1,003.40
6. Step 6: Final answer
   x = 1,124.52