Finding the Fourth Proportional to 1,958.40, 2,705.28 and 1,900.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,958.40 : 2,705.28 = 1,900.80 : x
2. Step 2: Convert to fraction form
   1,958.40/2,705.28 = 1,900.80/x
3. Step 3: Cross multiply
   1,958.40x = 2,705.28 × 1,900.80
4. Step 4: Simplify right side
   1,958.40x = 5,142,196.22
5. Step 5: Solve for x
   x = 5,142,196.22/1,958.40
6. Step 6: Final answer
   x = 2,625.71