Finding the Fourth Proportional to 1,900.89, 2,618.96 and 1,428.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,900.89 : 2,618.96 = 1,428.03 : x
2. Step 2: Convert to fraction form
   1,900.89/2,618.96 = 1,428.03/x
3. Step 3: Cross multiply
   1,900.89x = 2,618.96 × 1,428.03
4. Step 4: Simplify right side
   1,900.89x = 3,739,946.31
5. Step 5: Solve for x
   x = 3,739,946.31/1,900.89
6. Step 6: Final answer
   x = 1,967.47