Finding the Fourth Proportional to 2,069.42, 2,855.59 and 1,173.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.42 : 2,855.59 = 1,173.20 : x
2. Step 2: Convert to fraction form
   2,069.42/2,855.59 = 1,173.20/x
3. Step 3: Cross multiply
   2,069.42x = 2,855.59 × 1,173.20
4. Step 4: Simplify right side
   2,069.42x = 3,350,178.19
5. Step 5: Solve for x
   x = 3,350,178.19/2,069.42
6. Step 6: Final answer
   x = 1,618.90