Finding the Fourth Proportional to 1,039.25, 1,556.15 and 576.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.25 : 1,556.15 = 576.34 : x
2. Step 2: Convert to fraction form
   1,039.25/1,556.15 = 576.34/x
3. Step 3: Cross multiply
   1,039.25x = 1,556.15 × 576.34
4. Step 4: Simplify right side
   1,039.25x = 896,864.72
5. Step 5: Solve for x
   x = 896,864.72/1,039.25
6. Step 6: Final answer
   x = 862.99