Finding the Fourth Proportional to 1,286.86, 1,929.37 and 556.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,286.86 : 1,929.37 = 556.03 : x
2. Step 2: Convert to fraction form
   1,286.86/1,929.37 = 556.03/x
3. Step 3: Cross multiply
   1,286.86x = 1,929.37 × 556.03
4. Step 4: Simplify right side
   1,286.86x = 1,072,784.82
5. Step 5: Solve for x
   x = 1,072,784.82/1,286.86
6. Step 6: Final answer
   x = 833.65