Finding the Fourth Proportional to 1,191.87, 1,785.50 and 670.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.87 : 1,785.50 = 670.28 : x
2. Step 2: Convert to fraction form
   1,191.87/1,785.50 = 670.28/x
3. Step 3: Cross multiply
   1,191.87x = 1,785.50 × 670.28
4. Step 4: Simplify right side
   1,191.87x = 1,196,786.05
5. Step 5: Solve for x
   x = 1,196,786.05/1,191.87
6. Step 6: Final answer
   x = 1,004.12