Finding the Fourth Proportional to 2,039.99, 2,815.02 and 1,200.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,039.99 : 2,815.02 = 1,200.72 : x
2. Step 2: Convert to fraction form
   2,039.99/2,815.02 = 1,200.72/x
3. Step 3: Cross multiply
   2,039.99x = 2,815.02 × 1,200.72
4. Step 4: Simplify right side
   2,039.99x = 3,380,050.81
5. Step 5: Solve for x
   x = 3,380,050.81/2,039.99
6. Step 6: Final answer
   x = 1,656.90