Finding the Fourth Proportional to 1,076.12, 1,485.30 and 683.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.12 : 1,485.30 = 683.72 : x
2. Step 2: Convert to fraction form
   1,076.12/1,485.30 = 683.72/x
3. Step 3: Cross multiply
   1,076.12x = 1,485.30 × 683.72
4. Step 4: Simplify right side
   1,076.12x = 1,015,529.32
5. Step 5: Solve for x
   x = 1,015,529.32/1,076.12
6. Step 6: Final answer
   x = 943.70