Finding the Fourth Proportional to 2,022.16, 2,790.86 and 1,225.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,022.16 : 2,790.86 = 1,225.81 : x
2. Step 2: Convert to fraction form
   2,022.16/2,790.86 = 1,225.81/x
3. Step 3: Cross multiply
   2,022.16x = 2,790.86 × 1,225.81
4. Step 4: Simplify right side
   2,022.16x = 3,421,050.14
5. Step 5: Solve for x
   x = 3,421,050.14/2,022.16
6. Step 6: Final answer
   x = 1,691.78