Finding the Fourth Proportional to 3,729.90, 5,147.72 and 2,157.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,729.90 : 5,147.72 = 2,157.98 : x
2. Step 2: Convert to fraction form
   3,729.90/5,147.72 = 2,157.98/x
3. Step 3: Cross multiply
   3,729.90x = 5,147.72 × 2,157.98
4. Step 4: Simplify right side
   3,729.90x = 11,108,676.81
5. Step 5: Solve for x
   x = 11,108,676.81/3,729.90
6. Step 6: Final answer
   x = 2,978.28