Finding the Fourth Proportional to 3,728.72, 5,145.46 and 2,156.85

Step by Step Solution

1. Step 1: Write the proportion equation
   3,728.72 : 5,145.46 = 2,156.85 : x
2. Step 2: Convert to fraction form
   3,728.72/5,145.46 = 2,156.85/x
3. Step 3: Cross multiply
   3,728.72x = 5,145.46 × 2,156.85
4. Step 4: Simplify right side
   3,728.72x = 11,097,980.01
5. Step 5: Solve for x
   x = 11,097,980.01/3,728.72
6. Step 6: Final answer
   x = 2,976.35