Finding the Fourth Proportional to 1,665.10, 2,499.20 and 843.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.10 : 2,499.20 = 843.96 : x
2. Step 2: Convert to fraction form
   1,665.10/2,499.20 = 843.96/x
3. Step 3: Cross multiply
   1,665.10x = 2,499.20 × 843.96
4. Step 4: Simplify right side
   1,665.10x = 2,109,224.83
5. Step 5: Solve for x
   x = 2,109,224.83/1,665.10
6. Step 6: Final answer
   x = 1,266.73