Finding the Fourth Proportional to 1,039.94, 1,435.06 and 646.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.94 : 1,435.06 = 646.96 : x
2. Step 2: Convert to fraction form
   1,039.94/1,435.06 = 646.96/x
3. Step 3: Cross multiply
   1,039.94x = 1,435.06 × 646.96
4. Step 4: Simplify right side
   1,039.94x = 928,426.42
5. Step 5: Solve for x
   x = 928,426.42/1,039.94
6. Step 6: Final answer
   x = 892.77