Finding the Fourth Proportional to 2,619.33, 3,929.67 and 770.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.33 : 3,929.67 = 770.51 : x
2. Step 2: Convert to fraction form
   2,619.33/3,929.67 = 770.51/x
3. Step 3: Cross multiply
   2,619.33x = 3,929.67 × 770.51
4. Step 4: Simplify right side
   2,619.33x = 3,027,830.38
5. Step 5: Solve for x
   x = 3,027,830.38/2,619.33
6. Step 6: Final answer
   x = 1,155.96