Finding the Fourth Proportional to 2,415.09, 3,620.86 and 770.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,415.09 : 3,620.86 = 770.69 : x
2. Step 2: Convert to fraction form
   2,415.09/3,620.86 = 770.69/x
3. Step 3: Cross multiply
   2,415.09x = 3,620.86 × 770.69
4. Step 4: Simplify right side
   2,415.09x = 2,790,560.59
5. Step 5: Solve for x
   x = 2,790,560.59/2,415.09
6. Step 6: Final answer
   x = 1,155.47