Finding the Fourth Proportional to 1,139.50, 1,710.46 and 591.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.50 : 1,710.46 = 591.54 : x
2. Step 2: Convert to fraction form
   1,139.50/1,710.46 = 591.54/x
3. Step 3: Cross multiply
   1,139.50x = 1,710.46 × 591.54
4. Step 4: Simplify right side
   1,139.50x = 1,011,805.51
5. Step 5: Solve for x
   x = 1,011,805.51/1,139.50
6. Step 6: Final answer
   x = 887.94