Finding the Fourth Proportional to 1,034.72, 1,428 and 772.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,034.72 : 1,428 = 772.16 : x
2. Step 2: Convert to fraction form
   1,034.72/1,428 = 772.16/x
3. Step 3: Cross multiply
   1,034.72x = 1,428 × 772.16
4. Step 4: Simplify right side
   1,034.72x = 1,102,644.48
5. Step 5: Solve for x
   x = 1,102,644.48/1,034.72
6. Step 6: Final answer
   x = 1,065.65