Finding the Fourth Proportional to 1,059.34, 1,461.52 and 639.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.34 : 1,461.52 = 639.53 : x
2. Step 2: Convert to fraction form
   1,059.34/1,461.52 = 639.53/x
3. Step 3: Cross multiply
   1,059.34x = 1,461.52 × 639.53
4. Step 4: Simplify right side
   1,059.34x = 934,685.89
5. Step 5: Solve for x
   x = 934,685.89/1,059.34
6. Step 6: Final answer
   x = 882.33