Finding the Fourth Proportional to 2,131.38, 2,940.84 and 1,542.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.38 : 2,940.84 = 1,542.78 : x
2. Step 2: Convert to fraction form
   2,131.38/2,940.84 = 1,542.78/x
3. Step 3: Cross multiply
   2,131.38x = 2,940.84 × 1,542.78
4. Step 4: Simplify right side
   2,131.38x = 4,537,069.14
5. Step 5: Solve for x
   x = 4,537,069.14/2,131.38
6. Step 6: Final answer
   x = 2,128.70