Finding the Fourth Proportional to 2,071.63, 3,107.42 and 839.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.63 : 3,107.42 = 839.02 : x
2. Step 2: Convert to fraction form
   2,071.63/3,107.42 = 839.02/x
3. Step 3: Cross multiply
   2,071.63x = 3,107.42 × 839.02
4. Step 4: Simplify right side
   2,071.63x = 2,607,187.53
5. Step 5: Solve for x
   x = 2,607,187.53/2,071.63
6. Step 6: Final answer
   x = 1,258.52