Finding the Fourth Proportional to 2,123.60, 3,179.10 and 1,578.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.60 : 3,179.10 = 1,578.20 : x
2. Step 2: Convert to fraction form
   2,123.60/3,179.10 = 1,578.20/x
3. Step 3: Cross multiply
   2,123.60x = 3,179.10 × 1,578.20
4. Step 4: Simplify right side
   2,123.60x = 5,017,255.62
5. Step 5: Solve for x
   x = 5,017,255.62/2,123.60
6. Step 6: Final answer
   x = 2,362.62