Finding the Fourth Proportional to 3,399.08, 5,088.72 and 1,989.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,399.08 : 5,088.72 = 1,989.18 : x
2. Step 2: Convert to fraction form
   3,399.08/5,088.72 = 1,989.18/x
3. Step 3: Cross multiply
   3,399.08x = 5,088.72 × 1,989.18
4. Step 4: Simplify right side
   3,399.08x = 10,122,380.05
5. Step 5: Solve for x
   x = 10,122,380.05/3,399.08
6. Step 6: Final answer
   x = 2,977.98