Finding the Fourth Proportional to 2,071.72, 3,107.88 and 1,291.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.72 : 3,107.88 = 1,291.08 : x
2. Step 2: Convert to fraction form
   2,071.72/3,107.88 = 1,291.08/x
3. Step 3: Cross multiply
   2,071.72x = 3,107.88 × 1,291.08
4. Step 4: Simplify right side
   2,071.72x = 4,012,521.71
5. Step 5: Solve for x
   x = 4,012,521.71/2,071.72
6. Step 6: Final answer
   x = 1,936.81