Finding the Fourth Proportional to 1,179.91, 1,628.72 and 786.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,179.91 : 1,628.72 = 786.79 : x
2. Step 2: Convert to fraction form
   1,179.91/1,628.72 = 786.79/x
3. Step 3: Cross multiply
   1,179.91x = 1,628.72 × 786.79
4. Step 4: Simplify right side
   1,179.91x = 1,281,454.43
5. Step 5: Solve for x
   x = 1,281,454.43/1,179.91
6. Step 6: Final answer
   x = 1,086.07