Finding the Fourth Proportional to 2,118.05, 3,172.96 and 1,190.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.05 : 3,172.96 = 1,190.78 : x
2. Step 2: Convert to fraction form
   2,118.05/3,172.96 = 1,190.78/x
3. Step 3: Cross multiply
   2,118.05x = 3,172.96 × 1,190.78
4. Step 4: Simplify right side
   2,118.05x = 3,778,297.31
5. Step 5: Solve for x
   x = 3,778,297.31/2,118.05
6. Step 6: Final answer
   x = 1,783.86