Finding the Fourth Proportional to 1,338.50, 2,003.49 and 872.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.50 : 2,003.49 = 872.55 : x
2. Step 2: Convert to fraction form
   1,338.50/2,003.49 = 872.55/x
3. Step 3: Cross multiply
   1,338.50x = 2,003.49 × 872.55
4. Step 4: Simplify right side
   1,338.50x = 1,748,145.20
5. Step 5: Solve for x
   x = 1,748,145.20/1,338.50
6. Step 6: Final answer
   x = 1,306.05