Finding the Fourth Proportional to 1,271.33, 1,755.17 and 970.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.33 : 1,755.17 = 970.21 : x
2. Step 2: Convert to fraction form
   1,271.33/1,755.17 = 970.21/x
3. Step 3: Cross multiply
   1,271.33x = 1,755.17 × 970.21
4. Step 4: Simplify right side
   1,271.33x = 1,702,884.47
5. Step 5: Solve for x
   x = 1,702,884.47/1,271.33
6. Step 6: Final answer
   x = 1,339.45