Finding the Fourth Proportional to 2,070.90, 2,857.86 and 1,186.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.90 : 2,857.86 = 1,186.83 : x
2. Step 2: Convert to fraction form
   2,070.90/2,857.86 = 1,186.83/x
3. Step 3: Cross multiply
   2,070.90x = 2,857.86 × 1,186.83
4. Step 4: Simplify right side
   2,070.90x = 3,391,793.98
5. Step 5: Solve for x
   x = 3,391,793.98/2,070.90
6. Step 6: Final answer
   x = 1,637.84