Finding the Fourth Proportional to 2,173.50, 3,261.72 and 805.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,173.50 : 3,261.72 = 805.50 : x
2. Step 2: Convert to fraction form
   2,173.50/3,261.72 = 805.50/x
3. Step 3: Cross multiply
   2,173.50x = 3,261.72 × 805.50
4. Step 4: Simplify right side
   2,173.50x = 2,627,315.46
5. Step 5: Solve for x
   x = 2,627,315.46/2,173.50
6. Step 6: Final answer
   x = 1,208.79