Finding the Fourth Proportional to 1,288.73, 1,776.81 and 1,052.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.73 : 1,776.81 = 1,052.43 : x
2. Step 2: Convert to fraction form
   1,288.73/1,776.81 = 1,052.43/x
3. Step 3: Cross multiply
   1,288.73x = 1,776.81 × 1,052.43
4. Step 4: Simplify right side
   1,288.73x = 1,869,968.15
5. Step 5: Solve for x
   x = 1,869,968.15/1,288.73
6. Step 6: Final answer
   x = 1,451.02