Finding the Fourth Proportional to 2,180.71, 3,009.40 and 1,185.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,180.71 : 3,009.40 = 1,185.99 : x
2. Step 2: Convert to fraction form
   2,180.71/3,009.40 = 1,185.99/x
3. Step 3: Cross multiply
   2,180.71x = 3,009.40 × 1,185.99
4. Step 4: Simplify right side
   2,180.71x = 3,569,118.31
5. Step 5: Solve for x
   x = 3,569,118.31/2,180.71
6. Step 6: Final answer
   x = 1,636.68