Finding the Fourth Proportional to 2,424.12, 3,636.37 and 780.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,424.12 : 3,636.37 = 780.72 : x
2. Step 2: Convert to fraction form
   2,424.12/3,636.37 = 780.72/x
3. Step 3: Cross multiply
   2,424.12x = 3,636.37 × 780.72
4. Step 4: Simplify right side
   2,424.12x = 2,838,964.70
5. Step 5: Solve for x
   x = 2,838,964.70/2,424.12
6. Step 6: Final answer
   x = 1,171.13