Finding the Fourth Proportional to 1,021.48, 1,411.71 and 772.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,021.48 : 1,411.71 = 772.72 : x
2. Step 2: Convert to fraction form
   1,021.48/1,411.71 = 772.72/x
3. Step 3: Cross multiply
   1,021.48x = 1,411.71 × 772.72
4. Step 4: Simplify right side
   1,021.48x = 1,090,856.55
5. Step 5: Solve for x
   x = 1,090,856.55/1,021.48
6. Step 6: Final answer
   x = 1,067.92