Finding the Fourth Proportional to 2,621.58, 3,931.60 and 772.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.58 : 3,931.60 = 772.34 : x
2. Step 2: Convert to fraction form
   2,621.58/3,931.60 = 772.34/x
3. Step 3: Cross multiply
   2,621.58x = 3,931.60 × 772.34
4. Step 4: Simplify right side
   2,621.58x = 3,036,531.94
5. Step 5: Solve for x
   x = 3,036,531.94/2,621.58
6. Step 6: Final answer
   x = 1,158.28