Finding the Fourth Proportional to 2,145.17, 2,959.65 and 1,200.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.17 : 2,959.65 = 1,200.83 : x
2. Step 2: Convert to fraction form
   2,145.17/2,959.65 = 1,200.83/x
3. Step 3: Cross multiply
   2,145.17x = 2,959.65 × 1,200.83
4. Step 4: Simplify right side
   2,145.17x = 3,554,021.71
5. Step 5: Solve for x
   x = 3,554,021.71/2,145.17
6. Step 6: Final answer
   x = 1,656.75