Finding the Fourth Proportional to 2,086.66, 3,131.51 and 1,680.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.66 : 3,131.51 = 1,680.70 : x
2. Step 2: Convert to fraction form
   2,086.66/3,131.51 = 1,680.70/x
3. Step 3: Cross multiply
   2,086.66x = 3,131.51 × 1,680.70
4. Step 4: Simplify right side
   2,086.66x = 5,263,127.95
5. Step 5: Solve for x
   x = 5,263,127.95/2,086.66
6. Step 6: Final answer
   x = 2,522.27