Finding the Fourth Proportional to 1,171.16, 1,755.52 and 478.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.16 : 1,755.52 = 478.31 : x
2. Step 2: Convert to fraction form
   1,171.16/1,755.52 = 478.31/x
3. Step 3: Cross multiply
   1,171.16x = 1,755.52 × 478.31
4. Step 4: Simplify right side
   1,171.16x = 839,675.49
5. Step 5: Solve for x
   x = 839,675.49/1,171.16
6. Step 6: Final answer
   x = 716.96