Finding the Fourth Proportional to 2,190.16, 3,019.70 and 1,906.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,190.16 : 3,019.70 = 1,906.15 : x
2. Step 2: Convert to fraction form
   2,190.16/3,019.70 = 1,906.15/x
3. Step 3: Cross multiply
   2,190.16x = 3,019.70 × 1,906.15
4. Step 4: Simplify right side
   2,190.16x = 5,755,993.31
5. Step 5: Solve for x
   x = 5,755,993.31/2,190.16
6. Step 6: Final answer
   x = 2,628.12