Finding the Fourth Proportional to 2,414.90, 3,621.72 and 770.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,414.90 : 3,621.72 = 770.60 : x
2. Step 2: Convert to fraction form
   2,414.90/3,621.72 = 770.60/x
3. Step 3: Cross multiply
   2,414.90x = 3,621.72 × 770.60
4. Step 4: Simplify right side
   2,414.90x = 2,790,897.43
5. Step 5: Solve for x
   x = 2,790,897.43/2,414.90
6. Step 6: Final answer
   x = 1,155.70