Finding the Fourth Proportional to 1,060.33, 1,463.55 and 640.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,060.33 : 1,463.55 = 640.72 : x
2. Step 2: Convert to fraction form
   1,060.33/1,463.55 = 640.72/x
3. Step 3: Cross multiply
   1,060.33x = 1,463.55 × 640.72
4. Step 4: Simplify right side
   1,060.33x = 937,725.76
5. Step 5: Solve for x
   x = 937,725.76/1,060.33
6. Step 6: Final answer
   x = 884.37