Finding the Fourth Proportional to 851.31, 1,174.71 and 478.29

Step by Step Solution

1. Step 1: Write the proportion equation
   851.31 : 1,174.71 = 478.29 : x
2. Step 2: Convert to fraction form
   851.31/1,174.71 = 478.29/x
3. Step 3: Cross multiply
   851.31x = 1,174.71 × 478.29
4. Step 4: Simplify right side
   851.31x = 561,852.05
5. Step 5: Solve for x
   x = 561,852.05/851.31
6. Step 6: Final answer
   x = 659.99