Finding the Fourth Proportional to 1,333.62, 1,840.91 and 891.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,333.62 : 1,840.91 = 891.36 : x
2. Step 2: Convert to fraction form
   1,333.62/1,840.91 = 891.36/x
3. Step 3: Cross multiply
   1,333.62x = 1,840.91 × 891.36
4. Step 4: Simplify right side
   1,333.62x = 1,640,909.08
5. Step 5: Solve for x
   x = 1,640,909.08/1,333.62
6. Step 6: Final answer
   x = 1,230.42