Finding the Fourth Proportional to 2,629.45, 3,943.49 and 780.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.45 : 3,943.49 = 780.14 : x
2. Step 2: Convert to fraction form
   2,629.45/3,943.49 = 780.14/x
3. Step 3: Cross multiply
   2,629.45x = 3,943.49 × 780.14
4. Step 4: Simplify right side
   2,629.45x = 3,076,486.10
5. Step 5: Solve for x
   x = 3,076,486.10/2,629.45
6. Step 6: Final answer
   x = 1,170.01