Finding the Fourth Proportional to 1,107.07, 1,527.83 and 641.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,107.07 : 1,527.83 = 641.32 : x
2. Step 2: Convert to fraction form
   1,107.07/1,527.83 = 641.32/x
3. Step 3: Cross multiply
   1,107.07x = 1,527.83 × 641.32
4. Step 4: Simplify right side
   1,107.07x = 979,823.31
5. Step 5: Solve for x
   x = 979,823.31/1,107.07
6. Step 6: Final answer
   x = 885.06