Finding the Fourth Proportional to 1,039.59, 1,559.59 and 491.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.59 : 1,559.59 = 491.83 : x
2. Step 2: Convert to fraction form
   1,039.59/1,559.59 = 491.83/x
3. Step 3: Cross multiply
   1,039.59x = 1,559.59 × 491.83
4. Step 4: Simplify right side
   1,039.59x = 767,048.02
5. Step 5: Solve for x
   x = 767,048.02/1,039.59
6. Step 6: Final answer
   x = 737.84