Finding the Fourth Proportional to 1,288.41, 1,776.38 and 1,052.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.41 : 1,776.38 = 1,052.12 : x
2. Step 2: Convert to fraction form
   1,288.41/1,776.38 = 1,052.12/x
3. Step 3: Cross multiply
   1,288.41x = 1,776.38 × 1,052.12
4. Step 4: Simplify right side
   1,288.41x = 1,868,950.78
5. Step 5: Solve for x
   x = 1,868,950.78/1,288.41
6. Step 6: Final answer
   x = 1,450.59