Finding the Fourth Proportional to 1,910.42, 2,636.28 and 1,071.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,910.42 : 2,636.28 = 1,071.21 : x
2. Step 2: Convert to fraction form
   1,910.42/2,636.28 = 1,071.21/x
3. Step 3: Cross multiply
   1,910.42x = 2,636.28 × 1,071.21
4. Step 4: Simplify right side
   1,910.42x = 2,824,009.50
5. Step 5: Solve for x
   x = 2,824,009.50/1,910.42
6. Step 6: Final answer
   x = 1,478.22