Finding the Fourth Proportional to 2,071.56, 2,857.88 and 1,371.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.56 : 2,857.88 = 1,371.72 : x
2. Step 2: Convert to fraction form
   2,071.56/2,857.88 = 1,371.72/x
3. Step 3: Cross multiply
   2,071.56x = 2,857.88 × 1,371.72
4. Step 4: Simplify right side
   2,071.56x = 3,920,211.15
5. Step 5: Solve for x
   x = 3,920,211.15/2,071.56
6. Step 6: Final answer
   x = 1,892.40