Finding the Fourth Proportional to 2,961.68, 4,086.52 and 1,900.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,961.68 : 4,086.52 = 1,900.40 : x
2. Step 2: Convert to fraction form
   2,961.68/4,086.52 = 1,900.40/x
3. Step 3: Cross multiply
   2,961.68x = 4,086.52 × 1,900.40
4. Step 4: Simplify right side
   2,961.68x = 7,766,022.61
5. Step 5: Solve for x
   x = 7,766,022.61/2,961.68
6. Step 6: Final answer
   x = 2,622.17