Finding the Fourth Proportional to 1,072.10, 1,610.55 and 1,043.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.10 : 1,610.55 = 1,043.30 : x
2. Step 2: Convert to fraction form
   1,072.10/1,610.55 = 1,043.30/x
3. Step 3: Cross multiply
   1,072.10x = 1,610.55 × 1,043.30
4. Step 4: Simplify right side
   1,072.10x = 1,680,286.82
5. Step 5: Solve for x
   x = 1,680,286.82/1,072.10
6. Step 6: Final answer
   x = 1,567.29