Finding the Fourth Proportional to 1,579.91, 2,178.50 and 1,358.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,579.91 : 2,178.50 = 1,358.78 : x
2. Step 2: Convert to fraction form
   1,579.91/2,178.50 = 1,358.78/x
3. Step 3: Cross multiply
   1,579.91x = 2,178.50 × 1,358.78
4. Step 4: Simplify right side
   1,579.91x = 2,960,084.54
5. Step 5: Solve for x
   x = 2,960,084.54/1,579.91
6. Step 6: Final answer
   x = 1,873.58