Finding the Fourth Proportional to 1,039.32, 1,434.30 and 573.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.32 : 1,434.30 = 573.60 : x
2. Step 2: Convert to fraction form
   1,039.32/1,434.30 = 573.60/x
3. Step 3: Cross multiply
   1,039.32x = 1,434.30 × 573.60
4. Step 4: Simplify right side
   1,039.32x = 822,714.48
5. Step 5: Solve for x
   x = 822,714.48/1,039.32
6. Step 6: Final answer
   x = 791.59