Finding the Fourth Proportional to 1,579.10, 2,178.59 and 940.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,579.10 : 2,178.59 = 940.91 : x
2. Step 2: Convert to fraction form
   1,579.10/2,178.59 = 940.91/x
3. Step 3: Cross multiply
   1,579.10x = 2,178.59 × 940.91
4. Step 4: Simplify right side
   1,579.10x = 2,049,864.92
5. Step 5: Solve for x
   x = 2,049,864.92/1,579.10
6. Step 6: Final answer
   x = 1,298.12