Finding the Fourth Proportional to 1,059.57, 1,461.96 and 617.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.57 : 1,461.96 = 617.21 : x
2. Step 2: Convert to fraction form
   1,059.57/1,461.96 = 617.21/x
3. Step 3: Cross multiply
   1,059.57x = 1,461.96 × 617.21
4. Step 4: Simplify right side
   1,059.57x = 902,336.33
5. Step 5: Solve for x
   x = 902,336.33/1,059.57
6. Step 6: Final answer
   x = 851.61