Finding the Fourth Proportional to 1,107.03, 1,527.61 and 641.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,107.03 : 1,527.61 = 641.31 : x
2. Step 2: Convert to fraction form
   1,107.03/1,527.61 = 641.31/x
3. Step 3: Cross multiply
   1,107.03x = 1,527.61 × 641.31
4. Step 4: Simplify right side
   1,107.03x = 979,671.57
5. Step 5: Solve for x
   x = 979,671.57/1,107.03
6. Step 6: Final answer
   x = 884.95