Finding the Fourth Proportional to 1,780.56, 2,667.64 and 1,086.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.56 : 2,667.64 = 1,086.84 : x
2. Step 2: Convert to fraction form
   1,780.56/2,667.64 = 1,086.84/x
3. Step 3: Cross multiply
   1,780.56x = 2,667.64 × 1,086.84
4. Step 4: Simplify right side
   1,780.56x = 2,899,297.86
5. Step 5: Solve for x
   x = 2,899,297.86/1,780.56
6. Step 6: Final answer
   x = 1,628.31