Finding the Fourth Proportional to 2,423.88, 3,635.86 and 780.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,423.88 : 3,635.86 = 780.12 : x
2. Step 2: Convert to fraction form
   2,423.88/3,635.86 = 780.12/x
3. Step 3: Cross multiply
   2,423.88x = 3,635.86 × 780.12
4. Step 4: Simplify right side
   2,423.88x = 2,836,407.10
5. Step 5: Solve for x
   x = 2,836,407.10/2,423.88
6. Step 6: Final answer
   x = 1,170.19