Finding the Fourth Proportional to 1,335.30, 1,841.61 and 863.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.30 : 1,841.61 = 863.20 : x
2. Step 2: Convert to fraction form
   1,335.30/1,841.61 = 863.20/x
3. Step 3: Cross multiply
   1,335.30x = 1,841.61 × 863.20
4. Step 4: Simplify right side
   1,335.30x = 1,589,677.75
5. Step 5: Solve for x
   x = 1,589,677.75/1,335.30
6. Step 6: Final answer
   x = 1,190.50