Finding the Fourth Proportional to 2,145.20, 2,960.06 and 1,200.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.20 : 2,960.06 = 1,200.86 : x
2. Step 2: Convert to fraction form
   2,145.20/2,960.06 = 1,200.86/x
3. Step 3: Cross multiply
   2,145.20x = 2,960.06 × 1,200.86
4. Step 4: Simplify right side
   2,145.20x = 3,554,596.85
5. Step 5: Solve for x
   x = 3,554,596.85/2,145.20
6. Step 6: Final answer
   x = 1,657.00