Finding the Fourth Proportional to 1,910.78, 2,636.98 and 1,071.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,910.78 : 2,636.98 = 1,071.50 : x
2. Step 2: Convert to fraction form
   1,910.78/2,636.98 = 1,071.50/x
3. Step 3: Cross multiply
   1,910.78x = 2,636.98 × 1,071.50
4. Step 4: Simplify right side
   1,910.78x = 2,825,524.07
5. Step 5: Solve for x
   x = 2,825,524.07/1,910.78
6. Step 6: Final answer
   x = 1,478.73