Finding the Fourth Proportional to 1,003.43, 1,384.81 and 561.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.43 : 1,384.81 = 561.41 : x
2. Step 2: Convert to fraction form
   1,003.43/1,384.81 = 561.41/x
3. Step 3: Cross multiply
   1,003.43x = 1,384.81 × 561.41
4. Step 4: Simplify right side
   1,003.43x = 777,446.18
5. Step 5: Solve for x
   x = 777,446.18/1,003.43
6. Step 6: Final answer
   x = 774.79