Finding the Fourth Proportional to 1,812.82, 2,718.43 and 772.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,812.82 : 2,718.43 = 772.78 : x
2. Step 2: Convert to fraction form
   1,812.82/2,718.43 = 772.78/x
3. Step 3: Cross multiply
   1,812.82x = 2,718.43 × 772.78
4. Step 4: Simplify right side
   1,812.82x = 2,100,748.34
5. Step 5: Solve for x
   x = 2,100,748.34/1,812.82
6. Step 6: Final answer
   x = 1,158.83