Finding the Fourth Proportional to 1,287.23, 1,929.82 and 556.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.23 : 1,929.82 = 556.29 : x
2. Step 2: Convert to fraction form
   1,287.23/1,929.82 = 556.29/x
3. Step 3: Cross multiply
   1,287.23x = 1,929.82 × 556.29
4. Step 4: Simplify right side
   1,287.23x = 1,073,539.57
5. Step 5: Solve for x
   x = 1,073,539.57/1,287.23
6. Step 6: Final answer
   x = 833.99