Finding the Fourth Proportional to 2,412.79, 3,619.22 and 770.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,412.79 : 3,619.22 = 770.72 : x
2. Step 2: Convert to fraction form
   2,412.79/3,619.22 = 770.72/x
3. Step 3: Cross multiply
   2,412.79x = 3,619.22 × 770.72
4. Step 4: Simplify right side
   2,412.79x = 2,789,405.24
5. Step 5: Solve for x
   x = 2,789,405.24/2,412.79
6. Step 6: Final answer
   x = 1,156.09