Finding the Fourth Proportional to 1,039.46, 1,434.74 and 646.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.46 : 1,434.74 = 646.25 : x
2. Step 2: Convert to fraction form
   1,039.46/1,434.74 = 646.25/x
3. Step 3: Cross multiply
   1,039.46x = 1,434.74 × 646.25
4. Step 4: Simplify right side
   1,039.46x = 927,190.32
5. Step 5: Solve for x
   x = 927,190.32/1,039.46
6. Step 6: Final answer
   x = 892.00