Finding the Fourth Proportional to 2,069.12, 2,855.66 and 1,570.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.12 : 2,855.66 = 1,570.91 : x
2. Step 2: Convert to fraction form
   2,069.12/2,855.66 = 1,570.91/x
3. Step 3: Cross multiply
   2,069.12x = 2,855.66 × 1,570.91
4. Step 4: Simplify right side
   2,069.12x = 4,485,962.72
5. Step 5: Solve for x
   x = 4,485,962.72/2,069.12
6. Step 6: Final answer
   x = 2,168.05