Finding the Fourth Proportional to 1,059.16, 1,462.03 and 639.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.16 : 1,462.03 = 639.53 : x
2. Step 2: Convert to fraction form
   1,059.16/1,462.03 = 639.53/x
3. Step 3: Cross multiply
   1,059.16x = 1,462.03 × 639.53
4. Step 4: Simplify right side
   1,059.16x = 935,004.74
5. Step 5: Solve for x
   x = 935,004.74/1,059.16
6. Step 6: Final answer
   x = 882.78