Finding the Fourth Proportional to 1,375.58, 1,897.43 and 1,043.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.58 : 1,897.43 = 1,043.28 : x
2. Step 2: Convert to fraction form
   1,375.58/1,897.43 = 1,043.28/x
3. Step 3: Cross multiply
   1,375.58x = 1,897.43 × 1,043.28
4. Step 4: Simplify right side
   1,375.58x = 1,979,545.55
5. Step 5: Solve for x
   x = 1,979,545.55/1,375.58
6. Step 6: Final answer
   x = 1,439.06