Finding the Fourth Proportional to 2,071.97, 3,109.04 and 840.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.97 : 3,109.04 = 840.29 : x
2. Step 2: Convert to fraction form
   2,071.97/3,109.04 = 840.29/x
3. Step 3: Cross multiply
   2,071.97x = 3,109.04 × 840.29
4. Step 4: Simplify right side
   2,071.97x = 2,612,495.22
5. Step 5: Solve for x
   x = 2,612,495.22/2,071.97
6. Step 6: Final answer
   x = 1,260.88