Finding the Fourth Proportional to 2,145.30, 2,960.85 and 1,555.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.30 : 2,960.85 = 1,555.62 : x
2. Step 2: Convert to fraction form
   2,145.30/2,960.85 = 1,555.62/x
3. Step 3: Cross multiply
   2,145.30x = 2,960.85 × 1,555.62
4. Step 4: Simplify right side
   2,145.30x = 4,605,957.48
5. Step 5: Solve for x
   x = 4,605,957.48/2,145.30
6. Step 6: Final answer
   x = 2,147.00