Finding the Fourth Proportional to 3,724.42, 5,139.68 and 2,109.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,724.42 : 5,139.68 = 2,109.30 : x
2. Step 2: Convert to fraction form
   3,724.42/5,139.68 = 2,109.30/x
3. Step 3: Cross multiply
   3,724.42x = 5,139.68 × 2,109.30
4. Step 4: Simplify right side
   3,724.42x = 10,841,127.02
5. Step 5: Solve for x
   x = 10,841,127.02/3,724.42
6. Step 6: Final answer
   x = 2,910.82