Finding the Fourth Proportional to 3,724.56, 5,139.50 and 2,153.16

Step by Step Solution

1. Step 1: Write the proportion equation
   3,724.56 : 5,139.50 = 2,153.16 : x
2. Step 2: Convert to fraction form
   3,724.56/5,139.50 = 2,153.16/x
3. Step 3: Cross multiply
   3,724.56x = 5,139.50 × 2,153.16
4. Step 4: Simplify right side
   3,724.56x = 11,066,165.82
5. Step 5: Solve for x
   x = 11,066,165.82/3,724.56
6. Step 6: Final answer
   x = 2,971.13