Finding the Fourth Proportional to 1,031.28, 1,422.96 and 768.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.28 : 1,422.96 = 768.72 : x
2. Step 2: Convert to fraction form
   1,031.28/1,422.96 = 768.72/x
3. Step 3: Cross multiply
   1,031.28x = 1,422.96 × 768.72
4. Step 4: Simplify right side
   1,031.28x = 1,093,857.81
5. Step 5: Solve for x
   x = 1,093,857.81/1,031.28
6. Step 6: Final answer
   x = 1,060.68