Finding the Fourth Proportional to 1,910.81, 2,636.87 and 1,071.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,910.81 : 2,636.87 = 1,071.55 : x
2. Step 2: Convert to fraction form
   1,910.81/2,636.87 = 1,071.55/x
3. Step 3: Cross multiply
   1,910.81x = 2,636.87 × 1,071.55
4. Step 4: Simplify right side
   1,910.81x = 2,825,532.69
5. Step 5: Solve for x
   x = 2,825,532.69/1,910.81
6. Step 6: Final answer
   x = 1,478.71