Finding the Fourth Proportional to 2,145.03, 2,959.86 and 1,200.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.03 : 2,959.86 = 1,200.78 : x
2. Step 2: Convert to fraction form
   2,145.03/2,959.86 = 1,200.78/x
3. Step 3: Cross multiply
   2,145.03x = 2,959.86 × 1,200.78
4. Step 4: Simplify right side
   2,145.03x = 3,554,140.69
5. Step 5: Solve for x
   x = 3,554,140.69/2,145.03
6. Step 6: Final answer
   x = 1,656.92