Finding the Fourth Proportional to 1,857.51, 2,563.49 and 1,071.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,857.51 : 2,563.49 = 1,071.61 : x
2. Step 2: Convert to fraction form
   1,857.51/2,563.49 = 1,071.61/x
3. Step 3: Cross multiply
   1,857.51x = 2,563.49 × 1,071.61
4. Step 4: Simplify right side
   1,857.51x = 2,747,061.52
5. Step 5: Solve for x
   x = 2,747,061.52/1,857.51
6. Step 6: Final answer
   x = 1,478.89