Finding the Fourth Proportional to 2,084.79, 3,128.42 and 769.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.79 : 3,128.42 = 769.47 : x
2. Step 2: Convert to fraction form
   2,084.79/3,128.42 = 769.47/x
3. Step 3: Cross multiply
   2,084.79x = 3,128.42 × 769.47
4. Step 4: Simplify right side
   2,084.79x = 2,407,225.34
5. Step 5: Solve for x
   x = 2,407,225.34/2,084.79
6. Step 6: Final answer
   x = 1,154.66