Finding the Fourth Proportional to 1,438.23, 1,985.39 and 1,118.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.23 : 1,985.39 = 1,118.47 : x
2. Step 2: Convert to fraction form
   1,438.23/1,985.39 = 1,118.47/x
3. Step 3: Cross multiply
   1,438.23x = 1,985.39 × 1,118.47
4. Step 4: Simplify right side
   1,438.23x = 2,220,603.04
5. Step 5: Solve for x
   x = 2,220,603.04/1,438.23
6. Step 6: Final answer
   x = 1,543.99