Finding the Fourth Proportional to 1,039.23, 1,434.76 and 646.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.23 : 1,434.76 = 646.79 : x
2. Step 2: Convert to fraction form
   1,039.23/1,434.76 = 646.79/x
3. Step 3: Cross multiply
   1,039.23x = 1,434.76 × 646.79
4. Step 4: Simplify right side
   1,039.23x = 927,983.27
5. Step 5: Solve for x
   x = 927,983.27/1,039.23
6. Step 6: Final answer
   x = 892.95