Finding the Fourth Proportional to 1,123.50, 1,685.91 and 1,003.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.50 : 1,685.91 = 1,003.22 : x
2. Step 2: Convert to fraction form
   1,123.50/1,685.91 = 1,003.22/x
3. Step 3: Cross multiply
   1,123.50x = 1,685.91 × 1,003.22
4. Step 4: Simplify right side
   1,123.50x = 1,691,340.28
5. Step 5: Solve for x
   x = 1,691,340.28/1,123.50
6. Step 6: Final answer
   x = 1,505.42