Finding the Fourth Proportional to 1,428.93, 1,969.82 and 1,228.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.93 : 1,969.82 = 1,228.86 : x
2. Step 2: Convert to fraction form
   1,428.93/1,969.82 = 1,228.86/x
3. Step 3: Cross multiply
   1,428.93x = 1,969.82 × 1,228.86
4. Step 4: Simplify right side
   1,428.93x = 2,420,626.86
5. Step 5: Solve for x
   x = 2,420,626.86/1,428.93
6. Step 6: Final answer
   x = 1,694.01