Finding the Fourth Proportional to 5,601.60, 8,404.56 and 2,139.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,601.60 : 8,404.56 = 2,139.12 : x
2. Step 2: Convert to fraction form
   5,601.60/8,404.56 = 2,139.12/x
3. Step 3: Cross multiply
   5,601.60x = 8,404.56 × 2,139.12
4. Step 4: Simplify right side
   5,601.60x = 17,978,362.39
5. Step 5: Solve for x
   x = 17,978,362.39/5,601.60
6. Step 6: Final answer
   x = 3,209.50