Finding the Fourth Proportional to 2,424.30, 3,636.69 and 780.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,424.30 : 3,636.69 = 780.45 : x
2. Step 2: Convert to fraction form
   2,424.30/3,636.69 = 780.45/x
3. Step 3: Cross multiply
   2,424.30x = 3,636.69 × 780.45
4. Step 4: Simplify right side
   2,424.30x = 2,838,254.71
5. Step 5: Solve for x
   x = 2,838,254.71/2,424.30
6. Step 6: Final answer
   x = 1,170.75