Finding the Fourth Proportional to 1,910.72, 2,636.89 and 1,071.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,910.72 : 2,636.89 = 1,071.56 : x
2. Step 2: Convert to fraction form
   1,910.72/2,636.89 = 1,071.56/x
3. Step 3: Cross multiply
   1,910.72x = 2,636.89 × 1,071.56
4. Step 4: Simplify right side
   1,910.72x = 2,825,589.76
5. Step 5: Solve for x
   x = 2,825,589.76/1,910.72
6. Step 6: Final answer
   x = 1,478.81