Finding the Fourth Proportional to 2,070.69, 2,857.46 and 1,186.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.69 : 2,857.46 = 1,186.58 : x
2. Step 2: Convert to fraction form
   2,070.69/2,857.46 = 1,186.58/x
3. Step 3: Cross multiply
   2,070.69x = 2,857.46 × 1,186.58
4. Step 4: Simplify right side
   2,070.69x = 3,390,593.57
5. Step 5: Solve for x
   x = 3,390,593.57/2,070.69
6. Step 6: Final answer
   x = 1,637.42