Finding the Fourth Proportional to 1,812.24, 2,718.72 and 772.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,812.24 : 2,718.72 = 772.23 : x
2. Step 2: Convert to fraction form
   1,812.24/2,718.72 = 772.23/x
3. Step 3: Cross multiply
   1,812.24x = 2,718.72 × 772.23
4. Step 4: Simplify right side
   1,812.24x = 2,099,477.15
5. Step 5: Solve for x
   x = 2,099,477.15/1,812.24
6. Step 6: Final answer
   x = 1,158.50