Finding the Fourth Proportional to 2,618.59, 3,926.94 and 769.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.59 : 3,926.94 = 769.21 : x
2. Step 2: Convert to fraction form
   2,618.59/3,926.94 = 769.21/x
3. Step 3: Cross multiply
   2,618.59x = 3,926.94 × 769.21
4. Step 4: Simplify right side
   2,618.59x = 3,020,641.52
5. Step 5: Solve for x
   x = 3,020,641.52/2,618.59
6. Step 6: Final answer
   x = 1,153.54