Finding the Fourth Proportional to 1,638.06, 2,260.55 and 892.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.06 : 2,260.55 = 892.03 : x
2. Step 2: Convert to fraction form
   1,638.06/2,260.55 = 892.03/x
3. Step 3: Cross multiply
   1,638.06x = 2,260.55 × 892.03
4. Step 4: Simplify right side
   1,638.06x = 2,016,478.42
5. Step 5: Solve for x
   x = 2,016,478.42/1,638.06
6. Step 6: Final answer
   x = 1,231.02