Finding the Fourth Proportional to 1,034.15, 1,426.52 and 640.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,034.15 : 1,426.52 = 640.89 : x
2. Step 2: Convert to fraction form
   1,034.15/1,426.52 = 640.89/x
3. Step 3: Cross multiply
   1,034.15x = 1,426.52 × 640.89
4. Step 4: Simplify right side
   1,034.15x = 914,244.01
5. Step 5: Solve for x
   x = 914,244.01/1,034.15
6. Step 6: Final answer
   x = 884.06