Finding the Fourth Proportional to 1,998.78, 2,758.24 and 1,114.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,998.78 : 2,758.24 = 1,114.54 : x
2. Step 2: Convert to fraction form
   1,998.78/2,758.24 = 1,114.54/x
3. Step 3: Cross multiply
   1,998.78x = 2,758.24 × 1,114.54
4. Step 4: Simplify right side
   1,998.78x = 3,074,168.81
5. Step 5: Solve for x
   x = 3,074,168.81/1,998.78
6. Step 6: Final answer
   x = 1,538.02