Finding the Fourth Proportional to 2,423.77, 3,636.15 and 780.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,423.77 : 3,636.15 = 780.28 : x
2. Step 2: Convert to fraction form
   2,423.77/3,636.15 = 780.28/x
3. Step 3: Cross multiply
   2,423.77x = 3,636.15 × 780.28
4. Step 4: Simplify right side
   2,423.77x = 2,837,215.12
5. Step 5: Solve for x
   x = 2,837,215.12/2,423.77
6. Step 6: Final answer
   x = 1,170.58