Finding the Fourth Proportional to 1,428.58, 1,969.54 and 1,282.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.58 : 1,969.54 = 1,282.78 : x
2. Step 2: Convert to fraction form
   1,428.58/1,969.54 = 1,282.78/x
3. Step 3: Cross multiply
   1,428.58x = 1,969.54 × 1,282.78
4. Step 4: Simplify right side
   1,428.58x = 2,526,486.52
5. Step 5: Solve for x
   x = 2,526,486.52/1,428.58
6. Step 6: Final answer
   x = 1,768.53