Finding the Fourth Proportional to 1,033.42, 1,426.78 and 641.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,033.42 : 1,426.78 = 641.02 : x
2. Step 2: Convert to fraction form
   1,033.42/1,426.78 = 641.02/x
3. Step 3: Cross multiply
   1,033.42x = 1,426.78 × 641.02
4. Step 4: Simplify right side
   1,033.42x = 914,594.52
5. Step 5: Solve for x
   x = 914,594.52/1,033.42
6. Step 6: Final answer
   x = 885.02