Finding the Fourth Proportional to 1,280.79, 1,919.52 and 971.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.79 : 1,919.52 = 971.73 : x
2. Step 2: Convert to fraction form
   1,280.79/1,919.52 = 971.73/x
3. Step 3: Cross multiply
   1,280.79x = 1,919.52 × 971.73
4. Step 4: Simplify right side
   1,280.79x = 1,865,255.17
5. Step 5: Solve for x
   x = 1,865,255.17/1,280.79
6. Step 6: Final answer
   x = 1,456.33