Finding the Fourth Proportional to 1,438.72, 1,986.38 and 1,106.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.72 : 1,986.38 = 1,106.54 : x
2. Step 2: Convert to fraction form
   1,438.72/1,986.38 = 1,106.54/x
3. Step 3: Cross multiply
   1,438.72x = 1,986.38 × 1,106.54
4. Step 4: Simplify right side
   1,438.72x = 2,198,008.93
5. Step 5: Solve for x
   x = 2,198,008.93/1,438.72
6. Step 6: Final answer
   x = 1,527.75