Finding the Fourth Proportional to 2,070.83, 2,857.47 and 1,231.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.83 : 2,857.47 = 1,231.55 : x
2. Step 2: Convert to fraction form
   2,070.83/2,857.47 = 1,231.55/x
3. Step 3: Cross multiply
   2,070.83x = 2,857.47 × 1,231.55
4. Step 4: Simplify right side
   2,070.83x = 3,519,102.89
5. Step 5: Solve for x
   x = 3,519,102.89/2,070.83
6. Step 6: Final answer
   x = 1,699.37