Finding the Fourth Proportional to 5,128.78, 7,696.42 and 2,941.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128.78 : 7,696.42 = 2,941.78 : x
2. Step 2: Convert to fraction form
   5,128.78/7,696.42 = 2,941.78/x
3. Step 3: Cross multiply
   5,128.78x = 7,696.42 × 2,941.78
4. Step 4: Simplify right side
   5,128.78x = 22,641,174.43
5. Step 5: Solve for x
   x = 22,641,174.43/5,128.78
6. Step 6: Final answer
   x = 4,414.53