Finding the Fourth Proportional to 1,008.32, 1,391.83 and 610.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.32 : 1,391.83 = 610.21 : x
2. Step 2: Convert to fraction form
   1,008.32/1,391.83 = 610.21/x
3. Step 3: Cross multiply
   1,008.32x = 1,391.83 × 610.21
4. Step 4: Simplify right side
   1,008.32x = 849,308.58
5. Step 5: Solve for x
   x = 849,308.58/1,008.32
6. Step 6: Final answer
   x = 842.30