Finding the Fourth Proportional to 1,438.41, 2,155.58 and 1,112.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.41 : 2,155.58 = 1,112.25 : x
2. Step 2: Convert to fraction form
   1,438.41/2,155.58 = 1,112.25/x
3. Step 3: Cross multiply
   1,438.41x = 2,155.58 × 1,112.25
4. Step 4: Simplify right side
   1,438.41x = 2,397,538.29
5. Step 5: Solve for x
   x = 2,397,538.29/1,438.41
6. Step 6: Final answer
   x = 1,666.80