Finding the Fourth Proportional to 1,164.20, 1,744.88 and 891.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.20 : 1,744.88 = 891.43 : x
2. Step 2: Convert to fraction form
   1,164.20/1,744.88 = 891.43/x
3. Step 3: Cross multiply
   1,164.20x = 1,744.88 × 891.43
4. Step 4: Simplify right side
   1,164.20x = 1,555,429.56
5. Step 5: Solve for x
   x = 1,555,429.56/1,164.20
6. Step 6: Final answer
   x = 1,336.06