Finding the Fourth Proportional to 2,156.79, 2,976.61 and 1,199.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.79 : 2,976.61 = 1,199.79 : x
2. Step 2: Convert to fraction form
   2,156.79/2,976.61 = 1,199.79/x
3. Step 3: Cross multiply
   2,156.79x = 2,976.61 × 1,199.79
4. Step 4: Simplify right side
   2,156.79x = 3,571,309.54
5. Step 5: Solve for x
   x = 3,571,309.54/2,156.79
6. Step 6: Final answer
   x = 1,655.85