Finding the Fourth Proportional to 1,059.82, 1,462.28 and 640.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.82 : 1,462.28 = 640.10 : x
2. Step 2: Convert to fraction form
   1,059.82/1,462.28 = 640.10/x
3. Step 3: Cross multiply
   1,059.82x = 1,462.28 × 640.10
4. Step 4: Simplify right side
   1,059.82x = 936,005.88
5. Step 5: Solve for x
   x = 936,005.88/1,059.82
6. Step 6: Final answer
   x = 883.18