Finding the Fourth Proportional to 1,971.89, 2,721.11 and 1,185.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,971.89 : 2,721.11 = 1,185.78 : x
2. Step 2: Convert to fraction form
   1,971.89/2,721.11 = 1,185.78/x
3. Step 3: Cross multiply
   1,971.89x = 2,721.11 × 1,185.78
4. Step 4: Simplify right side
   1,971.89x = 3,226,631.89
5. Step 5: Solve for x
   x = 3,226,631.89/1,971.89
6. Step 6: Final answer
   x = 1,636.32