Finding the Fourth Proportional to 1,488.57, 2,233.25 and 839.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.57 : 2,233.25 = 839.76 : x
2. Step 2: Convert to fraction form
   1,488.57/2,233.25 = 839.76/x
3. Step 3: Cross multiply
   1,488.57x = 2,233.25 × 839.76
4. Step 4: Simplify right side
   1,488.57x = 1,875,394.02
5. Step 5: Solve for x
   x = 1,875,394.02/1,488.57
6. Step 6: Final answer
   x = 1,259.86