Finding the Fourth Proportional to 1,971.78, 2,721.78 and 1,185.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,971.78 : 2,721.78 = 1,185.82 : x
2. Step 2: Convert to fraction form
   1,971.78/2,721.78 = 1,185.82/x
3. Step 3: Cross multiply
   1,971.78x = 2,721.78 × 1,185.82
4. Step 4: Simplify right side
   1,971.78x = 3,227,541.16
5. Step 5: Solve for x
   x = 3,227,541.16/1,971.78
6. Step 6: Final answer
   x = 1,636.87