Finding the Fourth Proportional to 1,139.67, 1,710.16 and 481.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.67 : 1,710.16 = 481.50 : x
2. Step 2: Convert to fraction form
   1,139.67/1,710.16 = 481.50/x
3. Step 3: Cross multiply
   1,139.67x = 1,710.16 × 481.50
4. Step 4: Simplify right side
   1,139.67x = 823,442.04
5. Step 5: Solve for x
   x = 823,442.04/1,139.67
6. Step 6: Final answer
   x = 722.53