Finding the Fourth Proportional to 3,725.34, 5,140.72 and 2,131.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,725.34 : 5,140.72 = 2,131.80 : x
2. Step 2: Convert to fraction form
   3,725.34/5,140.72 = 2,131.80/x
3. Step 3: Cross multiply
   3,725.34x = 5,140.72 × 2,131.80
4. Step 4: Simplify right side
   3,725.34x = 10,958,986.90
5. Step 5: Solve for x
   x = 10,958,986.90/3,725.34
6. Step 6: Final answer
   x = 2,941.74