Finding the Fourth Proportional to 1,145.52, 1,579.59 and 772.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.52 : 1,579.59 = 772.56 : x
2. Step 2: Convert to fraction form
   1,145.52/1,579.59 = 772.56/x
3. Step 3: Cross multiply
   1,145.52x = 1,579.59 × 772.56
4. Step 4: Simplify right side
   1,145.52x = 1,220,328.05
5. Step 5: Solve for x
   x = 1,220,328.05/1,145.52
6. Step 6: Final answer
   x = 1,065.30