Finding the Fourth Proportional to 3,728.82, 5,145.86 and 2,157

Step by Step Solution

1. Step 1: Write the proportion equation
   3,728.82 : 5,145.86 = 2,157 : x
2. Step 2: Convert to fraction form
   3,728.82/5,145.86 = 2,157/x
3. Step 3: Cross multiply
   3,728.82x = 5,145.86 × 2,157
4. Step 4: Simplify right side
   3,728.82x = 11,099,620.02
5. Step 5: Solve for x
   x = 11,099,620.02/3,728.82
6. Step 6: Final answer
   x = 2,976.71