Finding the Fourth Proportional to 1,251.72, 1,878.18 and 559.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,251.72 : 1,878.18 = 559.38 : x
2. Step 2: Convert to fraction form
   1,251.72/1,878.18 = 559.38/x
3. Step 3: Cross multiply
   1,251.72x = 1,878.18 × 559.38
4. Step 4: Simplify right side
   1,251.72x = 1,050,616.33
5. Step 5: Solve for x
   x = 1,050,616.33/1,251.72
6. Step 6: Final answer
   x = 839.34