Finding the Fourth Proportional to 1,004.32, 1,385.94 and 611.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,004.32 : 1,385.94 = 611.20 : x
2. Step 2: Convert to fraction form
   1,004.32/1,385.94 = 611.20/x
3. Step 3: Cross multiply
   1,004.32x = 1,385.94 × 611.20
4. Step 4: Simplify right side
   1,004.32x = 847,086.53
5. Step 5: Solve for x
   x = 847,086.53/1,004.32
6. Step 6: Final answer
   x = 843.44