Finding the Fourth Proportional to 2,072.50, 2,860.06 and 1,128.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.50 : 2,860.06 = 1,128.30 : x
2. Step 2: Convert to fraction form
   2,072.50/2,860.06 = 1,128.30/x
3. Step 3: Cross multiply
   2,072.50x = 2,860.06 × 1,128.30
4. Step 4: Simplify right side
   2,072.50x = 3,227,005.70
5. Step 5: Solve for x
   x = 3,227,005.70/2,072.50
6. Step 6: Final answer
   x = 1,557.06