Finding the Fourth Proportional to 2,071.50, 2,857.17 and 1,186.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.50 : 2,857.17 = 1,186.98 : x
2. Step 2: Convert to fraction form
   2,071.50/2,857.17 = 1,186.98/x
3. Step 3: Cross multiply
   2,071.50x = 2,857.17 × 1,186.98
4. Step 4: Simplify right side
   2,071.50x = 3,391,403.65
5. Step 5: Solve for x
   x = 3,391,403.65/2,071.50
6. Step 6: Final answer
   x = 1,637.17