Finding the Fourth Proportional to 1,591.89, 2,196.78 and 970.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.89 : 2,196.78 = 970.89 : x
2. Step 2: Convert to fraction form
   1,591.89/2,196.78 = 970.89/x
3. Step 3: Cross multiply
   1,591.89x = 2,196.78 × 970.89
4. Step 4: Simplify right side
   1,591.89x = 2,132,831.73
5. Step 5: Solve for x
   x = 2,132,831.73/1,591.89
6. Step 6: Final answer
   x = 1,339.81