Finding the Fourth Proportional to 2,621.61, 3,933.12 and 772.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.61 : 3,933.12 = 772.71 : x
2. Step 2: Convert to fraction form
   2,621.61/3,933.12 = 772.71/x
3. Step 3: Cross multiply
   2,621.61x = 3,933.12 × 772.71
4. Step 4: Simplify right side
   2,621.61x = 3,039,161.16
5. Step 5: Solve for x
   x = 3,039,161.16/2,621.61
6. Step 6: Final answer
   x = 1,159.27