Finding the Fourth Proportional to 1,139.76, 1,717.79 and 1,076.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.76 : 1,717.79 = 1,076.18 : x
2. Step 2: Convert to fraction form
   1,139.76/1,717.79 = 1,076.18/x
3. Step 3: Cross multiply
   1,139.76x = 1,717.79 × 1,076.18
4. Step 4: Simplify right side
   1,139.76x = 1,848,637.27
5. Step 5: Solve for x
   x = 1,848,637.27/1,139.76
6. Step 6: Final answer
   x = 1,621.95