Finding the Fourth Proportional to 1,333.40, 1,839.62 and 891.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,333.40 : 1,839.62 = 891.58 : x
2. Step 2: Convert to fraction form
   1,333.40/1,839.62 = 891.58/x
3. Step 3: Cross multiply
   1,333.40x = 1,839.62 × 891.58
4. Step 4: Simplify right side
   1,333.40x = 1,640,168.40
5. Step 5: Solve for x
   x = 1,640,168.40/1,333.40
6. Step 6: Final answer
   x = 1,230.06