Finding the Fourth Proportional to 2,621.46, 3,931.56 and 772.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.46 : 3,931.56 = 772.07 : x
2. Step 2: Convert to fraction form
   2,621.46/3,931.56 = 772.07/x
3. Step 3: Cross multiply
   2,621.46x = 3,931.56 × 772.07
4. Step 4: Simplify right side
   2,621.46x = 3,035,449.36
5. Step 5: Solve for x
   x = 3,035,449.36/2,621.46
6. Step 6: Final answer
   x = 1,157.92