Finding the Fourth Proportional to 3,725.89, 5,142.20 and 2,153.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,725.89 : 5,142.20 = 2,153.98 : x
2. Step 2: Convert to fraction form
   3,725.89/5,142.20 = 2,153.98/x
3. Step 3: Cross multiply
   3,725.89x = 5,142.20 × 2,153.98
4. Step 4: Simplify right side
   3,725.89x = 11,076,195.96
5. Step 5: Solve for x
   x = 11,076,195.96/3,725.89
6. Step 6: Final answer
   x = 2,972.77