Finding the Fourth Proportional to 1,287.05, 1,930.03 and 556.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.05 : 1,930.03 = 556.10 : x
2. Step 2: Convert to fraction form
   1,287.05/1,930.03 = 556.10/x
3. Step 3: Cross multiply
   1,287.05x = 1,930.03 × 556.10
4. Step 4: Simplify right side
   1,287.05x = 1,073,299.86
5. Step 5: Solve for x
   x = 1,073,299.86/1,287.05
6. Step 6: Final answer
   x = 833.92