Finding the Fourth Proportional to 1,056.52, 1,454.78 and 936.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.52 : 1,454.78 = 936.78 : x
2. Step 2: Convert to fraction form
   1,056.52/1,454.78 = 936.78/x
3. Step 3: Cross multiply
   1,056.52x = 1,454.78 × 936.78
4. Step 4: Simplify right side
   1,056.52x = 1,362,808.81
5. Step 5: Solve for x
   x = 1,362,808.81/1,056.52
6. Step 6: Final answer
   x = 1,289.90