Finding the Fourth Proportional to 2,039.70, 2,814.72 and 1,200.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,039.70 : 2,814.72 = 1,200.21 : x
2. Step 2: Convert to fraction form
   2,039.70/2,814.72 = 1,200.21/x
3. Step 3: Cross multiply
   2,039.70x = 2,814.72 × 1,200.21
4. Step 4: Simplify right side
   2,039.70x = 3,378,240.04
5. Step 5: Solve for x
   x = 3,378,240.04/2,039.70
6. Step 6: Final answer
   x = 1,656.25