Finding the Fourth Proportional to 1,107.34, 1,528.23 and 641.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,107.34 : 1,528.23 = 641.50 : x
2. Step 2: Convert to fraction form
   1,107.34/1,528.23 = 641.50/x
3. Step 3: Cross multiply
   1,107.34x = 1,528.23 × 641.50
4. Step 4: Simplify right side
   1,107.34x = 980,359.55
5. Step 5: Solve for x
   x = 980,359.55/1,107.34
6. Step 6: Final answer
   x = 885.33